I suppose they can resurrect any deceased (or entirely imaginary) actor they like and have it look real....or in this case, better than real.
But will audiences pay to go to a theater to see a stylized amalgam of, say, Theda Bara and Marilyn Monroe or will a living actor / actress with widespread name recognition still be able to command astronomical salaries?
Considering the increasing popularity of anime, I would suggest that there are an awful lot of people who simply don't care about "name" stars particularly, but there are still many who do, at least for the time being..
CGI muscles are definitely a portent. We actually have 5 complete NARUTO costumes in a box for use next Halloween ~ as with this Halloween. We know his popularity will increase. Best part about NARUTO is that he can clone himself!