Perhaps this could lead to an unexpected result, where if the tech becomes easy enough to use, regular people can create their own animes, entirely without studios, entirely generated by AI

There are already people making animation, or games for that matter, entirely by themselves. AI would allow more people to this easier, although if you are good at making these things without AI it will be easier to get to the desired goal than someone just asking an AI to make a “good shounen anime” and not saying anything more.