> How do you value people who learnt to code in the 80's, 90's or 2000's today?

Personally I rate them really really highly. They are always fascinating to talk to. But they also compete with newer cohorts who mature.

> Will new developers know/understand what they don't know, or will the new state of things simply become normalized?

Yes because a 32 year old guy with 10 years of experience who got given AI recently is going to be around for an awful long time reminding everyone that he has something the younger ones don't have.