> How can you both think AI will do a soulless garbage job and that it will displace all the creative people who put their blood sweat and tears into doing art.

They don't, that's why they're saying 20% of creative departments will remain. The part that will go is the part that's already soulless - making ads in the style of the current trendy drama series or what have you.

> If you think it can be 20 times easier to make a movie, then it seems to me that it would be 20 times less impactful to make a creative work, since the market should quickly react to creative success by making a ton of cheap knockoffs of your work until the dead horse is so thoroughly beaten that it's no longer even worth paying an AI to spit out cheap knock-offs

That seems pretty backwards, given Jevons paradox. The ease of writing knock-off fanfiction didn't mean people stopped writing novels. The average novel probably has a lot less impact now than in the past, but the big hits are bigger than ever.