i don't think there's anything wrong with him continuing to play if he can. i mean he's still better then a good number of backs out there. i'd hardly call clemens' cy young hanging on. i don't know nolan's final season stats but i'd bet they were above average.
i wish he would go to a good team and just play maybe 10 snaps a game. have a good run in the playoffs or maybe even a superbowl. emmitt is a good guy.