https://www.cnet.com/news/star-wars-mark-hamill-discusses-recasting-luke-and-leia/

Recast Princess Leia now that Carrie Fisher is gone? Audition another actor to play Luke Skywalker in his younger days? Those decisions might sound like heresy to Star Wars fans, but Mark Hamill, who's played Luke since 1977, is open to discussion.

Hamill, 66, has been vocal about not expecting Luke's story to play out as it has, even though his bizarre hopes for Luke involve a nudist colony on Tatooine.  But in a recent interview, he approved of Luke being digitally re-created for future movies, as Peter Cushing's Grand Moff Tarkin was in 2016's Rogue One: A Star Wars Story.