I was beginning to fade before the generation change mainly because of the lack of love and all the legalism. Once the generation change took place, my husband and I never went back except for an appearance or two at the Memorial for his mother's sake.
The generation of 1914 was beat into my head since I was a child. 1914 is what made it the "truth" and what made the FDS God's sole channel. Taking that away just made them liars and false prophets.
I would say that about 75% of the kids I grew up with left the WT. I doubt they left solely because of the generation change but I'm sure the change just cemented any doubts they had.