I think it bares being said: Physics certainly could fix a lot of the game's problems, but it's as likely to cause far more if not done well. So far there have been two major sports games to incorporate RTP in a meaningful way; one was completely built around it to the exclusion of a complete football game, the other was done to a very modest degree to ensure problems could be handled without destroying the game.
Madden would have to take the 2nd approach... bringing in physics one year at a time. Personally, I think they're holding off until other things (such as AI and locomotion) are done right, and I absolutely believe this is the way to go. Great physics with terrible AI (see Run Blocking for M10 vs. Run Blocking for M11) is just as problematic as the other way around.