New things will be possible that aren’t today. You’ll be able to pick the stars in your movie. The home base can be your childhood home. Your unrequited love can be virtually fulfilled. Etc etc.
Yes, and none of these hyperpersonal movies will be a blockbuster; they'll be lucky to have audiences requiring the fingers of more than one hand to count, because everyone will have their own hyperpersonal preferences.
A "blockbuster movie" implies commercial use. I think actual stars would object to their likeness being used in that way.
If you're talking about people firing up the ol' 5090 to make a "movie" about their favorite streamer falling madly in love with them for, ahem, personal use, I have no doubt that people will do that. And I will do everything in my power to avoid associating with such brain-rotted cretins.