Wait, so studios will have to avoid using AI tools, but then other people that do use those tools will be eating their lunch? Either there are a significant number of people that will base purchasing decisions on whether a game used AI in production, or there are not. This is a trivial question to answer by polling customers, or looking at what happens with competing products in your market segment, or any other variety of basic market research. Companies have to work with questions like this constantly.
Epic is exclusively mad because they think there are many people that will avoid (or pay less for, or delay purchase, or expect higher quality, or more worthwhile content, or... Anything like that) games that are produced with AI, and every game made with UE6 will have to bear that scarlet letter, and suffer lower sales. If they really believed you can make much bigger and better games with the new tools, then they would do it, and people will get over their skepticism to play fun games.