What this eventually boils down to is the innate fear of change that fans have with regard to their team’s stars. Most people are loath to give up on something good until it’s been proven that a once-productive player can no longer perform at the same level. That’s understandable, but it’s a terrible way to run a football team. Belichick knows that, and he’s spent 13 years moving on from players at exactly the right time.