What makes film directors, composers and maybe some writers and philosophers interesting is something that you don't see until end. A 60 or 70 year career as one long project of psychoanalysis, with the seeds in earlier works getting ever better formed and expressed later. So it's a privilege to live outside a great person's lifespan and see the "full works" as it were.
Here's where I cannot see AI comparing. Even if an AI could make one brilliant box-office killer film every day, using generative scripts, the hottest CGI and so on, those movies could not collectively compare with a human who is working out a deep question through the medium of an art and audience.