Good post, and comments.
There will not likely be any large exodus or "sudden" collapse, (unless a major issue with negative publicity takes place). However, the long slow brain drain has been taking place at least since the late '70s and is picking up steam considerably in the last 20 years since the information age was consumerized, (i.e. the internet brought into the everyday user).
Society's entire approach to information has changed. Even formal educational approaches are very different from what they used to be, (memorization, for example is no longer stressed, nor is an authoritative approach to sources, unless peer reviewed). People have learned to think critically for themselves, and in most cases, have learned to do so naturally, just by using information sources now available.
marlu-BTW, one interesting phenomenon I see fairly recently are "demi-apostates". That is, people who are somewhat half-believing. They choose to stay in the org despite some major flaws they see, they think the WTS still has some/many things right, yet post on ex-JW forums without regrets. According to the WTS, such people shouldn't even exist. Goes to show that they're losing more and more control.
Great point, and something I have observed as well. My approach with these types, (at least recently), has been to educate them about cognitive dissonance and let them connect the dots. It does get them thinking...
The WT cannot healthily survive in this climate forever.