I, personally, feel bad for Fox. I don't think he ever got enough credit for completely revamping his offense to appease Tim Tebow and squeezing out a playoff victory. Then doing a 180 to accommodate Peyton and getting them to the Superbowl. Those two offensive approaches are about as different as you can possibly get.
It's also not his fault Peyton's out there injured. (I'm tired of that too, if you're hurt, just say you're hurt, having it come out after the fact isn't changing anything.) He also couldn't control his defensive players not making any plays. I think it's a raw deal to act like changing him is going to solve those problems...