Granted he is a little too short, but shouldn't Supes be somewhere in his early/mid 30's? 37 is close enough for movies. I just can't think of anyone else who has the build, the look, and the acting chops other than Brandon Routh. I doubt they will even consider Tom Welling, even though the timing would be perfect.
I personally don't have a problem with someone 5'9" being Superman and it would open up the field to more choices but fanboys seem stuck on 6'2" or taller. Even though 5'9" can be faked into being taller on film.