The 'noo light' on "this generation" has yielded reactions from one extreme to the other. For some, it will be the proverbial last straw and they'll break a leg to get to the nearest exit.
And it might not happen overnight. When the 'generation' was redefined in 95, I didn't stampede to the exit. It took time for the actual implications of the new teaching to sink in. I had to muddle through years of indoctrination before my atrophied brain grasped what was really happening. Once I started to really question that, then other doubts and questions quickly spread the crack in the dam. Then I left.
The same could happen here. While some are grumbling, others scratching their heads, it's a sign that something doesn't add up. They may have to work through it. Some will accept the WT and slide back into a dub stupor while others will slowly awaken and come to their senses.
My gut feel is that if they got away with 1975, they can probably get away with this as well.
Yes, in the long run they got away with 1975. But it hurt them. They lost numbers, they had to rebuild. And 1995 generation change hurt them on a smaller scale. Each major shift in doctrine causes some to sit up, take notice, say 'fuck it' and leave. But in the end the religion will be there, in one form or another.