Not gonna happen with the RPG genre.
If people wanna play violent-free games, there's always chess and old-skool adventures. Me personally I don't mind violence, but I agree with Warren that the perversion of pushing violence through PR etc. is going too far (latest Hitman and nuns trailer for exemple, or Tomb Raper). This whole obession only shows one thing: Publishers are obsessed and desperate to sell more of their shallow games by trying to emulate good ol' Hollywood. Pathetic, but that's the sad world of entertainment we live in today. I know I won't vote with my wallet for such crap, and that's about the only thing I can do as a consumer.
Bring back good games with good stories and gameplay, with violence as the necessary means to achieve greater goals, not making violence the selling point itself.