That's true. But the thing with technology, and the reason we've kept up with Moore's law is that someone eventually has a bright idea that leaves current methods and improvement extrapolation in the dust, and then the real thing happens earlier than the most optimistic dates, and performs better than what people expected. The question is not if one day an AI can generate a movie that you can't differentiate from a human-made movie. The question is how long will it take for an AI generated movie to be better than all the human-made movies in history, if it's possible at all it'll happen much sooner than people think possible.