This is already happening. In Disney™'s Rogue One™: A Star Wars™ Story, they had Grand Moff Tarkin played by a recreation of Peter Cushing. Disney claims they won't use computers to resurrect Carrie Fisher, but I'm not sure I believe The Mouse.

I remember back when Final Fantasy: The Spirits Within came out, Square was saying that the Aki Ross character model would be like an actress. "While Square ruled out any chance of a sequel to The Spirits Within before it was even completed, Sakaguchi intended to position Aki as being the "main star" for Square Pictures, using her in later games and films by Square, and including the flexibility of being able to modify aspects such as her age for such appearances."

source: https://en.wikipedia.org/wiki/Final_Fantasy%3A_The_Spirits_W...