anewperson
But even at that Revelation 21:3 says the Kingdom which is in heaven will come down from heaven onto Earth.
I think you must've meant to say verse 2, not 3.
Too, I think you're quite mistaken in your interpretation of that verse.
The setting is after the 1000 years are up, also the test at the end of that period is over. At that point the purpose for which the "bride" of Christ (aka New Jerusalem, aka the 144,000 that had ruled with Christ) had gone to Heaven in the first place will have been fully accomplished. Such ones have no further reason for being in Heaven. Hence, the 144,000 return to the Earth to RESUME life in the flesh. Both Heaven and Earth will have been renewed, having been restored to the pure state they each were in prior to Satan having spoiled them.
The 144,000 (originally flesh) have no more business living in Heaven forever than Jesus (originally spirit) did living on the Earth forever. Also, when Jesus said "I go my way to prepare a place for you....", he never said nor meant that it would be forever. -- John 14:2, 3.
Yadirf
Daniel 11:35 ... a KEY prophecy that must be fulfilled before the "time of the end" gets underway.