This is a ridiculous statement. He takes pay cuts to get players, he's a Boston icon, Kraft loves him, he ain't going anywhere.
That's like saying Tim Duncan won't retire a spur.
He's signed through 2017, and if he is on the roster for the entire 2014 regular season, his contract is fully guaranteed for injury and skill. So that leaves us with three possible outcomes:
1) He continues to play at a high level until age 40
2) He plays poorly and is benched for Garrapolo. The Patriots keep him on the team and eat his salary
3) He plays poorly, is benched, and traded to some desperate team. The Patriots free up cap space and receive a king's ransom in draft picks.
Which do you think is the most likely outcome?