I agree, and I think that will be great.  When I'm feeling particularly optimistic, I think these technologies and the timing are going to work out well for what I'm working on.

Write the book with AI assistance for grammar and research.
Use AI image generators to help flesh out the characters.
AI voice to narrate.
Image to video to bring the characters and scenes alive.
Maybe even code assistance to build games from the content.

It really feels like it's going to be possible for a person to turn an idea into a movie at some point.