As far Brady goes, I think maybe outside of the media he's starting to feel the toll of these seasons in his 40s. He puts on a good face but I bet he's sore as shit afterwards. That combined with his family back home, maybe he's had a change of heart and wants to retire after this season is over.
I seriously doubt he simply wants out of New England to play for a different team. I just think maybe his body is telling him that 45 might be out of the question in the NFL.
If Brady wants to play after this season Kraft will keep him a Pat, barring injury. He's coming off a SB victory and his team is undefeated. When's the last time BB drafted a QB? If he hasn't recently why not draft a QB this year and let him learn from the best till Brady retires at 45 or whenever. Before Brady the Pats were garbage at the Saints and Bengals level Kraft might as well give Brady what he wants either way
They draft a QB almost every year. They drafted Stidhim this year. I think he may be the future.
The dynasty will still be over regardless.