Because when you're getting old and getting beat up (we already know he can't throw as far as he used to, and there is no way in predicting how quickly his arm strength may continue to diminish) it's difficult to project forward like you can with a younger player. Did you see Peyton Manning last year? He went from breaking the single season passing yards and TD's record one year, to being maybe half that guy the next year, to being one of the worst QB's in the league last year. That big contract he signed seemed all fine and dandy two years ago. And then, suddenly, it wasn't anymore.

I'll wait for your sarcastic attempt to dance around that one.