I would rather stick to this theme rather then go off into old Testament prophesies about today's Israel because honestly its confusing. The thing is if its talking about future events it could mean what's talked about by John in his revelation, or things that have happened already to Israel
1And I saw a new heaven and a new earth: for the first heaven and the first earth were passed away; and there was no more sea. 2And I John saw the holy city, new Jerusalem, coming down from God out of heaven, prepared as a bride adorned for her husband. 3And I heard a great voice out of heaven saying, Behold, the tabernacle of God is with men, and he will dwell with them, and they shall be his people, and God himself shall be with them, and be their God. 4And God shall wipe away all tears from their eyes; and there shall be no more death, neither sorrow, nor crying, neither shall there be any more pain: for the former things are passed away.
The verses in 1 Thessalonians 4 (and 1Corinthians 15) about what is termed the rapture - when do you think this will happen?
13 But we would not have you ignorant, brethren, concerning them that fall asleep; that ye sorrow not, even as the rest, who have no hope.
14 For if we believe that Jesus died and rose again, even so them also that are fallen asleep in Jesus will God bring with him.
15 For this we say unto you by the word of the Lord, that we that are alive, that are left unto the coming of the Lord, shall in no wise precede them that are fallen 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 that are alive, that are left, shall together with them be caught up in the clouds, to meet the Lord in the air: and so shall we ever be with the Lord.
18 Wherefore comfort one another with these words.
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.
Anyway, either way, once gone, there is no longer the concern about two holy nations at the same time, yes?
The nation comes together, and in time, becomes spiritually alive again (culminating in Zech 14).