From what I understood, the nations were supposed to be on the threshold of actually accomplishing independent rule, and being successful, without God. God cannot tolerate that, so He is going to disrupt things. The nations will be set up to destroy false religion (except the witlesses). The witlesses will be left, and the nations will be set up by God to persecute and try to destroy the witlesses (the Great Tribulation). At some point (and the Filthful and Disgraceful Slavebugger is silent on how long this will persist, but knowing all the broken promises by God, He could just leave it there for an extremely long time), God is supposed to step in and destroy everyone that is not a witless.
At the end of this battle, Satan and the demons will be imprisoned for the heinous crimes of wanting freedom for themselves and helping mankind be free. The witlesses have stories about the earth opening up and swallowing up people, and of hailstones weighing a "talent" (which could be anything from the 45 pounds that the Revelation book mentioned, up to 96 pounds). After, there are going to be a lot of dead people for the witlesses that survive to clean up--and, if the Washtowel Babble and Crap Slaveholdery's bad organization skills are an indication, this is going to be one very inefficient operation.
That is, if it ever happens. They are already 136 years late and counting.