It's already happening. Ones I speak with, things I see on pro-JW forums...
Many have completely discounted what has changed since the 20's, 40's, 60's - right up to the past 5 years. They simply say it only matters what is said now. Who cares about old publications? The other favourite one is "don't worry about the details, just ask yourself about the fundamentals - does God exist? Does he care? Is he going to do something?"
It's still the minority that are in the right place to ask themselves those questions and answer honestly. Few will really do anything other than answer a blind "yes" to each of the above questions.
There is plenty of covering the cracks of disillusionment with the wallpaper of cognitive dissonance going on now and it's just going to carry on.