I have to disagree. The same people who won't think existed in previous generations as well. The only difference was, they blindly regurgitated what Bob Martin et. al were saying.
There will always be people who won't think. The specific problem the OP is noticing, is "promising juniors" who then fizzle out and become these people who won't think. I think this is an interesting category to look at. Is AI making more of the non-thinkers appear promising erroneously? Or is it a comfortable but insidious offramp for the lazy-minded who previously would only think because they had to? Or are the demands of the tech industry, increasing velocity at the cost of conscientiousness, tempting/forcing juniors to use AI to preserve their jobs, but at the cost of their careers?