The Temple as a physical building and its three major sections and its spiritual representation is key in the Book of revelation to who is being save and who is not...or not a part of the New Jerusalem. It is the central symbol of true worship and the presence of God. It is there for a reason, and it's logical that this structure was not destroyed yet at the time of the writing.
There's one major issue with the assumption that John is referencing the literal temple in Jerusalem as he wrote Revelation.
The Bible literally tells us it is in heaven.
“And the temple of God was opened in heaven, and there was seen in his temple the ark of his testament: and there were lightnings, and voices, and thunderings, and an earthquake, and great hail. ”
Revelation 11:19 KJV
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Note that this temple has the ark of the covenant.... the original of which the one spoken of in the OT before Jeremiah hid it in a cave, was a copy. As was the Tabernacle and the temple in the OT, copies... the ark of the covenant had been seen in any temple for over 400 years.
“1 Now of the things which we have spoken this is the sum: We have such an high priest, who is set on the right hand of the throne of the Majesty in the heavens; 2 A minister of the sanctuary, and of the true tabernacle, which the Lord pitched, and not man. 3 For every high priest is ordained to offer gifts and sacrifices: wherefore it is of necessity that this man have somewhat also to offer. 4 For if he were on earth, he should not be a priest, seeing that there are priests that offer gifts according to the law: 5 Who serve unto the example and shadow of heavenly things, as Moses was admonished of God when he was about to make the tabernacle: for, See, saith he, that thou make all things according to the pattern shewed to thee in the mount. ”
Hebrews 8:1-5 KJV
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Here is revealed the sanctuary of the new covenant. The sanctuary of the first covenant was pitched by man, built by Moses; this is pitched by the Lord, not by man. In that sanctuary the earthly priests performed their service; in this, Christ, our great High Priest, ministers at God's right hand. One sanctuary was on earth, the other is in heaven. It is the sanctuary in heaven, incorporating the throne of God, the angelic host, and the new Jerusalem, that is regretted so often by John in the Revelation.
As for the text that says,
“And he said unto me, Thou must prophesy again before many peoples, and nations, and tongues, and kings. ”
Revelation 10:11 KJV
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is an instruction to the church of that time to which that particular section of Revelation occurs in the timeline. The church that ate that little book, The church which found it both bitter and sweet, the church which then went out to proclaim the gospel as revealed for that time in chapter 14. The church which is spoken of as a woman in chapter 12, a persecuted remnant in chapter 13, but a victorious bride in chapter 14. You cannot single out one verse and think that it stands alone and thus make a broad claim as to its relevance without taking into account the full picture and scope of Revelation, using Daniel as your foundation, and realising the historic scope encompasses the whole of humanity.
And that measuring of the sanctuary? The church... the people of God are the NT sanctuary/ temple of God... that measuring refers to judgement. S judgement that is even now in progress to determine who are sheep and who are goats, that there is no mistake during the soon to come harvest. You had that part correct.