As with music, it’s the composing and screenwriting that can be done with AI.
I am not convinced that you could ever do a movie or music generated by AI, that you couldn’t tell was done by AI. Therefore actors and musicians won’t go away.
But it’s the creative parts that will go away, like the songwriting and scriptwriting.
And here’s the thing. You can actually cover your tracks so that nobody will know you generated it with AI, you can easily run an LLM on your laptop, disconnected from the Internet, so you can destroy any evidence you used AI tools.
https://www.youtube.com/watch?v=eJt9narRaf4
This was from 12 years ago.
Imagine what can be done now with AI.