Let's assume that the Org. folded overnight (worldwide), and let's assume that whatever revival takes place cannot use the same resources as the former WTS.
Word reaches everyone within a few days. The elders hunker down and declare that the Great Tribulation has begun. Elders plan to take each bookstudy as his personal "flock" and any previous efforts made to keep an updated contact list are redoubled. Meetings would continue to be held as normal until the KMs and magazines run out. They would probably be longer than normal, due to "rally the troops" style speeches from the elders, and long, sermon-like prayers. Fringe people take the opportunity to fall away, but everyone else is initially excited to see something actually happen that was spoken about in the literature. Hardcore dubs become more hardcore, and average dubs are now motivated to pore over every magazine left and spend time reading their bible--motivated mainly by fear of destruction at an imminent armageddon!
COs and DOs do not vanish; their authority is actually strengthened amongst the loyal. Without direction from the top, however, they are left in the lurch for some time. COs are left with no choice but to stay at their present circuit until some direction tells them otherwise. Funding for COs becomes a haphazard affair, and they are therefore forced to find secular work to stay afloat. Some COs are unable to continue their responsibility. A few COs are able to keep doing as they used to, but most are limited to rare visits, or simply letters. The "special week of activity" is dead. His visits however, do become more personal and exciting because he reassures everyone that "Gog of Magog has attacked, so deliverance from Jehovah must be very near!!"
No one remembers the sayings about "Babylon the Great" being attacked first, because they are all busy huddling together and waiting for imminent "delivery."
The DOs take the reigns of authority and attempt to organize things as best they can with the COs. Letters from the "branch" now become letters from the DO. Every district now becomes the dominion of the DO assigned to it. Some districts are poorly organized, but some are able to cope to a degree. Any collaboration of DOs that arises affects only the districts in question. People preach more, convinced the end is near, but every remaining piece of literature is hoarded, and not placed until interest is shown on the return visit. Bibles are now the presentation instead of literature, and the remaining ones are only replaced if the current bible is worn beyond repair. The same principle goes for books.
As for what would happen after the KMs run out...congregations would simply use another year's KM.
I can probably keep going, but I think they could go on for at least a year before people start falling away en masse.
Edit: I didn't factor what would happen to the kingdom halls. If they are no longer a resource, then authority falls to the congregation level and the falling away starts sooner.
