1. Mark Hamill isn’t a has-been.
2. Where’s DeNiro?
You mean he's a 'never-was' then, right?
Yea, he kind of is...
He’s basically a voice actor for Cartoons, with an occasional appearance on a TV show, other than the new star wars giving him some screen work, he really isn’t top list talent. Fact he was LUKE makes him known, but he’s not a major player by any stretch.
About the only person on that list you could make an argument for that is still very much active in Hollywood is Reiner.. who is still making and producing major films.