The question then is, these that put on immortality at the last trump, would they begin experiencing eternity on this same old earth, or would their experiencing of eternity begin on the new earth? IOW, the thousand years are the first thousand years of the everlasting new earth.
Keeping in mind some of the following.
Matthew 24:35 Heaven and earth shall pass away, but my words shall not pass away.
36 But of that day and hour knoweth no man, no, not the angels of heaven, but my Father only
2 Peter 3:7 But the heavens and the earth, which are now, by the same word are kept in store, reserved unto fire against the day of judgment and perdition of ungodly men.
2 Peter 3:10 But the day of the Lord will come as a thief in the night; in the which the heavens shall pass away with a great noise, and the elements shall melt with fervent heat, the earth also and the works that are therein shall be burned up
2 Peter 3:13 Nevertheless we, according to his promise, look for new heavens and a new earth, wherein dwelleth righteousness.
As to 2 Peter 3:13 when was he expecting to see that? As of the day of the Lord when it comes as a thief in the night, thus both the heavens and the earth passing away, that this verse is meaning immediately following those events? Or was he expecting to see the NHNE, a thousand years, a little season later post that of when 2 Peter 3:10 is initially fulfilled? IOW, this huge gap between when 2 Peter 3:10 is initially fulfilled and when 2 Peter 3:13 is initially fulfilled.
Surely, no Premil could think 2 Peter 3:10 is meaning a thousand years and a little season post the 2nd coming. What then, the fact that verse says the heavens and earth pass away at the time. What earth will one be dwelling on once it passes away since it can't be the same earth they were dwelling on if it passes away instead?
Clearly, some Premils haven't thought some of these things all the way through, and maybe shouldn't be debating with Amils in the meantime in regards to whether the millennium fits the here and now or after the 2nd coming, until they have first made sense out of everything I submitted above. Meaning Premils in general. Not necessarily meaning you, though it could include you if you are debating with Amils as to where the millennium logically fits, and that you insist the new earth doesn't arrive after the old earth passes per 2 Peter 3:10 until a thousand years later, thus no earth for anyone to be dwelling on in the meantime if the old one passed away and that a new one hasn't even arrived yet..
Were Adam and Eve in eternity prior to Adam's disobedience?
Why is being restored to Adam's pre-disobedient state meaning we enter eternity?
There is a new heaven and earth during the Millennium. It is without sin, and the bondage of sin along with natural decay and death.
The NHNE is not eternity either. The NHNE is a totally different reality but it has a definite beginning. Eternity has no beginning nor an end and is without time altogether. The LOF also has a beginning, but until a definite end is determined they will forever be in the LOF.
What seems to be eternal is the soul. But then again the soul starts that eternal existence at the point of conception. So the soul is as you put it already eternal in Adam's dead corruptible physical body, and will remain eternal even in God's permanent incorruptible physical body, no matter at what point in creation time that exchange happens. Or eternal without a body, as the case with those in sheol since the Flood of Noah's day.
Some here think no one exists without a physical body, as you seem to also associate the physical body with being eternal.
"But the day of the Lord will come as a thief in the night; in the which the heavens shall pass away with a great noise, and the elements shall melt with fervent heat,"
Peter never says the earth passes away. He includes the earth as all the works on earth pass away. This happens at the Second Coming, and not Revelation 19. Have you thought about that at the Second Coming there is literally nothing made by man left on the earth, just the same as there are no more stars in the sky, because they all came to earth, as they are the angels? Humans declared that the stars are just gasses, a science fed to them by Satan himself. Notice how John puts this moment when the heavens pass away:
"And I beheld when he had opened the sixth seal, and, lo, there was a great earthquake; and the sun became black as sackcloth of hair, and the moon became as blood; And the stars of heaven fell unto the earth, even as a fig tree casteth her untimely figs, when she is shaken of a mighty wind. And the heaven departed as a scroll when it is rolled together; and every mountain and island were moved out of their places."
Every last star left heaven and came to earth. Heaven was rolled back as a scroll, it disappeared as in Peter's passing away. John says those stars landed similar to fig leaves hitting the ground. That does not describe how current science would describe the event. So if every star came to earth, that would mean this: they are the angels. The word star in Scripture has always referred to the angels. The morning star was an angel. The heavenly host, stars, are all angels. Jesus told us Himself he is bringing all the angels with Him at the Second Coming. Peter sees heaven passing away as being dissolved when in fact this Baptism of Fire represents both the angels coming to earth in fire, while all of man's works are burned up.
Nothing will be left on earth, except concrete rubble at the Second Coming. If any thing is left it will have been hidden underground by Satan and 10 world leaders so they can restore humanity as by a miracle. That is the head of the beast that is restored. Satan will deceive many by telling them the facts, that God just took everything away, and he can give life back to them.
That is the result of the coming of the Day of the Lord. But the Day of the Lord itself is earth restored for the Millennium reign of Christ which is the Day of the Lord that Peter told everyone not to be ignorant about. So yes we wait for the heavens and earth to be restored with eternal righteousness. The earth has to live through the final harvest that removes all eternal souls from Adam's dead corruptible flesh. The majority of souls will remain dead until they are cast into the LOF after the Day of the Lord. By dead, they are either in sheol or death, as the 4th Seal introduces Death as a secondary location of the soul besides sheol.
"And when he had opened the fourth seal, I heard the voice of the fourth beast say, Come and see. And I looked, and behold a pale horse: and his name that sat on him was Death, and Hell followed with him."
These two locations remain until after the Day of the Lord, and then:
"And I saw a great white throne, and him that sat on it, from whose face the earth and the heaven fled away; and there was found no place for them. And I saw the dead, small and great, stand before God; and the books were opened: and another book was opened, which is the book of life: and the dead were judged out of those things which were written in the books, according to their works. And the sea gave up the dead which were in it; and death and hell delivered up the dead which were in them: and they were judged every man according to their works. And death and hell were cast into the lake of fire. This is the second death."
The first death is the soul placed in death or sheol. The second death is all being placed into the LOF.