I honestly see this marriage working out.
Belichick has two goals right now, catch Shula and win a SB without Brady. And at 72 years old, he doesn't have time to rebuild a roster to do those. He's only going to coach for a turn-key contender.
Jerry doesn't have much time left, and I think he knows it. Reconciling with Jimmy now, after 25 years of arrogantly ignoring him? I think Jerry realizes it's time to leave nothing left unsaid.
Jerry wants to win now. Bill wants to win now. Both men are short on time. Jerry and co have built a roster that's ready to go.
This would be a short term deal, but it could give both of them what they want most.