It would, but I think the character of Two-Face is more interesting than to have a Scarecrow level presence, not to mention, of the Batman villains, he's most easy to see fitting into Nolan's Gotham.
Trust Nolan.
It's also been confirmed that Two-Face and Bats have a bit of a struggle/fight. Should be interesting.
I'm also really looking forward to Roberts' performance. From what we've seen, he seems FAR more "dangerous" and menacing than Falcone in Begins.
Wouldn't get your hopes up, guys. I, too, would love to see Two-Face fleshed out for longer than 30 minutes. His death would make sense, though. Kind of a grim, emotional close to a very dark film.
Man, I hope that whatever happened with you bro... that it gets better... Sometimes it can be very jarring when you have something personal happen like that and then immediately see a movie that deals with the same issue or close enough to take your breath away...