Perhaps only a few Star Wars fans remember that Alec Guinness was nominated for both an Oscar and a Golden Globe for his supporting role as Obi-Wan Kenobi in the original Star Wars movie.
Now that Mark Hamill will apparently fill Guinness' shoes as the new Jedi Master in Episode VIII, what are the odds Mark Hamill could earn similar or even greater recognition than Guinness? Slim, I'll admit, but I'm saying there's a chance.
First, let's forget about Hamill's performance in the original Star Wars thirty years ago ("But I was going into Tosche Station to pick up some power converters!"), and let's focus on what he's done since, which has been primarily voice acting.
Hamill has voice acted for both DC and Marvel animated movies and series as well as countless video games for three decades. Just a fraction of his voice credits include The Joker (fans say Hamill's performances beat out Nicholson and Ledger), The Trickster, Solomon Grundy, The Hobgoblin, Red Skull, and Wolverine. Recently, he's reprised his small screen role as The Trickster in The Flash on CW, and he has already received accolades for that performance, too. So, there's no doubt Hamill has the talent to portray Luke Skywalker in an illustrious, unforgettable manner.
Furthermore, as opposed to Guinness, who tolerated but never embraced the role of Obi-Wan (video), or Harrison Ford, who's been trying to kill Han Solo since The Empire Strikes Back, Hamill, despite having initial reservations about returning to the role, has largely embraced the character Luke Skywalker, even going so far recently as to authenticate, one-by-one, his autographs on Twitter.
So, first taking into account the thirty years he's been polishing his craft as a character actor, and then adding the chance-of-a-lifetime opportunity to reprise his iconic role, yes, I do think Mark Hamill has the potential to earn himself an Oscar, a Golden Globe, or a People's Choice nomination for Episode VIII—and maybe even win one. After all, Guinness told him nearly thirty years ago, "The Force will be with you, always."