OAM,
Nobody is saying that Cam shouldn't have maximized his advantages while he had them.
The problem is that his skill set, that relied so much on running the ball, has a shelf life. Simply put, it's hard to play that way, to absorb that many hits, and to also have a long career.
Cam got old, and couldn't continue to play the way that made him successful as his injuries went up. And he's got no plan B.