The situation in Revelation 21 parallels some statements in Daniel 7:27,28
The Bible does not agree with the Watchtower scenario for the institution of Kingdom Government on Earth.
It appears that the Holy Ones emerge from a conflict called the Great Tribulation which is centered in the third of the Earth that has benefited from selfish capitalism. It is the third of the Earth that includes the King of the North and the King of the South and its Revelation homologues (Wild Beast (Seventh and Eight head of which is Russia) and Babylon the Great (USA)).
Although the upheaval in the world order will affect everyone it will mainly devastate the privileged or Golden third. Daniel 7:11,12 "I kept on beholding until the beast was killed and its body was destroyed and it was given to the burning fire (Rev. 19:20) . But as for the rest of the beasts, their rulerships were taken away and there was a lengthening in life given to them for a time and a season."
The fact that this involves a lengthy process is seen at Dan.2:35 "And as for the stone that struck the image, it became a large mountain and filled the whole earth."
Members of this forum are celebrating the ineffectiveness of the preaching that JW's are doing. The low numbers are a sign that the preaching work is done.
Because of the worldwide brotherhood JW's can flee to safer havens with their "relatives" who live in lands perihperal to the devastation.
The hardened cadre of "Holy Ones" numbering around 6 million are actually a new nation. They are the same size as the average Nation in the United Nations. Like it or not they WILL take over world rulership as they obey the Universal Court.
Daniel 7:26,27 "And the Court itself proceeded to sit, and his own rulership they finally took away, in order to annihilate him and to destroy him totally. And the kingdom and the rulership and the grandeur of the kingdoms under all the heavens were given to the people who are the holy ones of the Supreme One. Their kingdom is an indefinitely lasting kingdom and all the rulerships will serve and obey even them."