You're free to disagree. But, that's not correct. Revelation is a book full of symbolism. Is a city literally going to come out of the sky? Or is that symbolic of a city of God?
And in the days of these kings shall the God of heaven set up a kingdom, which shall never be destroyed: and the kingdom shall not be left to other people, but it shall break in pieces and consume all these kingdoms, and it shall stand for ever. (Dan. 2:44 KJV)
The current city will be restored just as the rest of creation. It's not going to b destroyed. Paul said the creation groans waiting to be delivered from bondage.
18 For I reckon that the sufferings of this present time are not worthy to be compared with the glory which shall be revealed in us.
19 For the earnest expectation of the creature waiteth for the manifestation of the sons of God.
20 For the creature was made subject to vanity, not willingly, but by reason of him who hath subjected the same in hope,
21 Because the creature itself also shall be delivered from the bondage of corruption into the glorious liberty of the children of God. (Rom. 8:18-21 KJV)
Peter too speaks of the restoration of all things.
19 Repent ye therefore, and be converted, that your sins may be blotted out, when the times of refreshing shall come from the presence of the Lord;
20 And he shall send Jesus Christ, which before was preached unto you:
21 Whom the heaven must receive until the times of restitution of all things, which God hath spoken by the mouth of all his holy prophets since the world began. (Acts 3:19-21 KJV)
Notice God will make all things new, not all new things.
4 And 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.
5 And he that sat upon the throne said, Behold, I make all things new. And he said unto me, Write: for these words are true and faithful. (Rev. 21:4-5 KJV)
The New Jerusalem is the current city after it is restored.
17 For, behold, I create new heavens and a new earth: and the former shall not be remembered, nor come into mind.
18 But be ye glad and rejoice for ever in that which I create: for, behold, I create Jerusalem a rejoicing, and her people a joy.
19 And I will rejoice in Jerusalem, and joy in my people: and the voice of weeping shall be no more heard in her, nor the voice of crying. (Isa. 65:17-19 KJV)
Notice God said weeping and crying will be heard in her "no more". The implication is that weeping and crying are heard in her at present. This indicates that the New Jerusalem and the current Jerusalem are one and the same.