I think the WTS is going to get crazier over time: more controlling, more restrictive, more insane, with crazier ideas and "commandments." I think at first people will stay in (esp. born-ins who've never known the outside) but eventually the whole thing will start to slowly, and then more and more quickly fall apart and probably splinter some more, i.e. smaller, even wackier groups.
OR...it may get bigger and stay exactly the same. Only time will tell.