I do agree that the handmade craftmanship of 2D animation could not be replaced with AI. I do agree that computers paired with 2D animation has created beautiful work. However he says
it's only going to go away if we let it go away
And I think that is what people are worried about. I remember around the time of Princess and the Frog, Disney said 2D was coming back but they ended just dropping it. I can see a lot of studio who want to cut cost using AI to save money. Or the opposite spectrum of studio dumping way too much money into AI and ending up with something like Cats.