Can't speak for other denominations, but...
...(hoo boy, I can't believe I'm saying this again)...
......the WTS has stated - in no uncertain terms - that it plans to be around after Armageddon to govern in the New System, with the Warwick compound functioning as the de facto planetary capital (probably why they've gone out of their way to make it so nice, compared to their old digs).
Now, imagine the Org being given control of a small country tomorrow.
Within a decade or less, advances in science and medicine in said country will have ground to a halt... foreign entertainment would be banned... democracy, free speech, and freedom of religion would be nonexistent... any form of alternative sexual expression (even between heterosexual married couples) would be outlawed... travel outside the country would be restricted... creationism would be mandated in schools... the justice system would favor the religious elite... disfellowshipped individuals would be imprisoned or deported... and "apostates" would be sentenced to death without possibility of appeal or reprieve.
(BTW, anyone who denies this is either naive or lying.)
Now, image a regime like that encompassing the entire planet. Forever.
It's never been spelled out that explicitly, but I guarantee you that that's what would happen, "after the End", from the teachings of Jehovah's Witnesses.