But that's because, at present, AI generated video isn't very good. Consider the history of CGI. In the 1990s and early 2000s, it was common to complain about how the move away from practical sets in favor of CGI was making movies worse. And it was! You had backgrounds and monsters that looked like they escaped from a video game. But that complaint has pretty much died out these days as the tech got better (although Nolan's Oppenheimer did weirdly hype the fact that its simulated Trinity blast was done by practical effects).