Once something like Menlo Park or Bonham, TX (http://www.jehovahs-witness.com/topic/197640/real-story-on-why-watchtower-society-lost-kingdom-hall-bonham-texas?page=1) happens, Watchtower changes some things. Those were so rare anyway. Most all of the members of a particular group are going to stay with Watchtower and override some "crazy independent elders."
I hope some radical things can happen that prove that wrong. I really do. Some scandal in high places maybe.
But "they" appoint the leaders locally and organizationally. It would be hard to get a majority of the elders to do something against them most anywhere. It is possible that it is brewing right now, though. There may have been some holdout congregation that kept it's money from Watchtower and haven't been found out yet. But keep in mind that Watchtower sends the C.O. who goes over the books and money is the most important one to cover. They can't hide it, so that congregation, if it exists, is defying openly or embezzling. It would be fun to see it.