The G.B and its predecessors never admit they were wrong, they may only have a "clarified understanding", according to them.
Individual older J.W's now suffer from the "Sunk Cost Fallacy" and allied false reasoning, and also many have an ingrained sense of Pride.
It takes humility to admit you have been wrong all your life.
1914 will become "The Elephant In the Room" for the G.B, gullible J.W's will follow that lead. I do not expect a mass waking up, even less a mass exodus. But soon, only those older ones, over 50's etc. will be in the majority by a long way. The young will continue to leave as they have done, the young that remain will not be there because of belief, but only for family and social reasons.