I agree. He should stay and have one more year to get the Bills into the playoffs. With the starting QB going down your chances of winning - especially w/ Losman as your backup - pretty much dwindle down to nothing.
The Jets could be on the downturn w/ having to replace a headcoach and possibly their QB. The Dolphins could easily fall back down to earth, and sink into the quagmire again.
IMO the Patroits are the only favorite in this division from yr to yr, and the Bills have a better shot at success through maintaining their coaching staff and addressing needs via draft, FA, or trade.