Supes doesn't need a makeover. He needs a filmmaker who is willing to make a movie about who he is: a naive and sincere alien immigrant who fights for Truth, Justice and the American Way.
Filmmakers, if this scares you, stay away. No one wants to see a movie about Genericman.
Maybe they should just wait to see how Marvel handles Captain America
and just copy that. My hunch is that Marvel knows how to stay true to a superhero characters' core.