Why use replicas of actual human actors?
Instead, synthesize idealized virtual actors. I think that’s the way the gaming industry does it. They don’t depend on human stars. And gaming revenues are bigger than movie box office.
Gaming is interactive. Movies are passive activities. When it comes to quietly watching a film, people are going to want to see actors they recognize.
And some actors are timeless. Even though they haven't made a movie in decades, you could show a photo of John Wayne or Marilyn Monroe to almost any grade schooler and they'll know who they are.