Shabbat shalom, ATP.
Of course! The nations of the earth, all headed by believers who have been made rulers "over many cities," will still be extant and will be tributary, vassal, and subordinate to the Kingdom of God, represented by the King of Israel, the Anointed One, Yeshua`, the Son of God, the LAST King of David’s lineage!
Revelation 21:23-22:2
23 And the city had no need of the sun, neither of the moon, to shine in it: for the glory of God did lighten it, and the Lamb is the light thereof.
24 And the nations of them which are saved (“RESCUED"; “DELIVERED," not “justified by God") shall walk in the light of it: and the kings of the earth do bring their glory and honour into it.
25 And the gates of it shall not be shut at all by day: for there shall be no night there.
26 And they shall bring the glory and honour of the nations into it.
27 And there shall in no wise enter into it any thing that defileth, neither whatsoever worketh abomination, or maketh a lie: but they which are written in the Lamb's book of life.
22:1 And he shewed me a pure river of water of life, clear as crystal, proceeding out of the throne of God and of the Lamb.
2 In the midst of the street of it, and on either side of the river, was there the tree of life, which bare twelve manner of fruits, and yielded her fruit every month: and the leaves of the tree were for the healing of the nations.
KJV
While the City, the New Jerusalem, Yerushalayim haChadashah, will be huge and will be the capital city of the world, it will NOT be more than a city of the New Earth!
The New Jerusalem will be God’s “tabernacle” - God’s “TENT!” Just as the tent of Abraham was his house, so God’s tent will be HIS house! (Hebrews 11:8-10; Revelation 21:2-3; John 14:1-4)
Hebrews 11:8-10
8 By faith Abraham, when he was called to go out into a place which he should after receive for an inheritance, obeyed; and he went out, not knowing whither he went.
9 By faith he sojourned in the land of promise, as in a strange country, dwelling in tabernacles (skeenais) with Isaac and Jacob, the heirs with him of the same promise:
10 For he looked for a city which hath foundations, whose builder and maker is God.
KJV
Revelation 21:2-3
2 And I John saw the holy city, new Jerusalem, coming down from God out of heaven (ouranos = the sky), prepared as a bride adorned for her husband.
3 And I heard a great voice out of heaven saying, Behold, the tabernacle (hee skeenee) of God is with men, and he will dwell (skeenoosai) with them, and they shall be his people, and God himself shall be with them, and be their God.
KJV
John 14:1-4
14 Let not your heart be troubled: ye believe in God, believe also in me.
2 In my Father's house are many mansions: if it were not so, I would have told you. I go to prepare a place for you.
3 And if I go and prepare a place for you, I will come again, and receive you unto myself; that where I am, there ye may be also.
4 And whither I go ye know, and the way ye know.
KJV
An interesting thing to add is that Yeshua` was NOT talking about going to some ethereal “Heaven” being God’s house; He was talking about the New Jerusalem! And, read this passage carefully! Where does He ever say that He is going to take them there? He DOESN’T! In fact, we are told in Revelation that the New Jerusalem comes HERE instead!
So,...
The New Jerusalem is God’s “house" and the whole New Earth will be His “back yard!"