> So either training data is going to get more expensive because you're going to have to pay creators, or these models will slowly drift away from the contemporary cultural reality.

Nah, more likely is that contemporary cultural reality will just shift to accept the output of the models and we'll all be worse off. (Except for the people selling the models, they'll be better off.)

You'll be eating nothing but the cultural equivalent of junk food, because that's all you'll be able to afford. (Not because you don't have the money, but because artists can't afford to eat.)