> I'd hate for us to get stuck using dead actors providing something mimicking a performance.
It's funny to think about it now, but Peter Cushing and Alec Guinness were the two "big name" actors in Star Wars, and provided some of the best acting in the entire series. The look on Alec Guinness' face when he mentioned Luke's father being his good friend said more than the accumulated total of prequel movies and spinoffs could ever hope to.
As experienced professionals (with experience working in low budget action films in Peter Cushing's case) they added a lot of nuance to and took ownership of their roles that I doubt face-swapped actors will have the authority to for a long time, if ever. To be honest, it feels kind of weird to me that they are resurrecting an actor who has been dead for such a long time.
Having said that, I think the actual technology is good enough for de-aging when the actual actor can give a performance; realistic CGI replacements for actual people have been improving since 2009 when a cameo by THE Terminator was believable enough (somewhat because it conveniently got its face blown off immediately). Jeff Bridges in Tron Legacy was not bad: http://www.danplatt.com/?cat=91, and you won't notice the de-aged actors in the latest Marvel movies unless you are actively looking for them.