Yeah, I dont see why anyone is complaining. Sure, I think we all expected someone older, but that doens't mean anything. Nothing about this guy says he cant play the Mayor of a city like Gotham. He's also most likely not playing an existing character, so it's not unfaithful or anything. And even if they were calling him Mayor Hill... who cares? Loeb was black, Flass was fat, big whoop.
The only downside to this is that I was kinda hoping it'd be an opportunity for a cameo of some sorts. Not even necessarily a Batman-related cameo like Adam West, but just an older, respected actor who usually wouldn't appear in a Batman movie.
Although on second thought... this is a cameo. It's Batmanuel.