Just ask yourself if you can bring down another similar religion like the Mormons. The answer, of course, would be no.
Once a religion passes a critical level of a certain number of members it becomes self perpetuating. Should there be a serious crisis or schism there would be enough leaders to maintain a sect or a surviving remnant of the faithful.
During the Rutherford purges up to three quarters of the Bible Students (JWs) left and the hard core remained. Some of those splinter groups still remain up to this day. Smaller, milder and quieter.