Are those who are alive and remain out of luck then since they won't die and have part in the first resurrection, as you understand it?
No, because they are a part of
the first resurrection shown in Rev. 20.
15 For this we say unto you by the word of the Lord,
that we which are alive and remain unto the coming of the Lord shall not prevent them which are asleep.
16
For the Lord himself shall descend from heaven with a shout, with the voice of the archangel, and with the trump of God: and
the dead in Christ shall rise first:
17 Then
we which are alive and remain shall be caught up together with them in the clouds, to meet the Lord in the air: and so shall we ever be with the Lord.
Both the dead and the living
in Christ are changed ….
1 Corinthians 15:51-55
King James Version
51 Behold, I shew you a mystery; We shall not all sleep,
but we shall all be changed,
52 In a moment, in the twinkling of an eye, at the last trump: for the trumpet shall sound, and the dead shall be raised incorruptible,
and we shall be changed.
53 For this corruptible must put on
incorruption, and this mortal must put on
immortality.
54 So when this corruptible shall have put on
incorruption, and this mortal shall have put on
immortality, then shall be brought to pass the saying that is written,
Death is swallowed up in victory.
55 O death, where is thy sting? O grave, where is thy victory?