How would you feel about a Batman Beyond movie with George Clooney?
If Warners decided that they would move ahead with a live-action Batman Beyond after all, but that for whatever reason Keaton wasn't part of it, would you be okay with Clooney as Old Man Bruce?
I hated - and still hate - Batman & Robin, and I still loathe Clooney's performance as Batman. But I always said he was fine as Bruce Wayne (I mean, Clooney at that time basically was Bruce Wayne). Given the choice I'd easily want Keaton. But if he was out of the picture, I'd be happy with Clooney after seeing his cameo in The Flash (so long as he never suits up!).