I don't think the question is going to be so much about who the next coach is, i think it is going to be more about who is going to take over the football operations, and after Belichick hangs them up I believe they will return to the model they used before Belichick, a GM run team with an head coach. The truth of the matter, at least imo, is that Belichick is a special case, a head coach who has the breadth of knowledge and capability to run an entire football operation from that position. He cannot be replaced by one person, and I think the approach they will take will be to first try to get him to take over as GM when he steps down as coach. I doubt he will do that. Then they will try to maintain the model and principles he has established and split the responsibilities among a GM an Coach. It may be Caserio/MacDaniels, or Pioli or Dimitroff could return if Caserio has already moved on.
If I were going to bet on anyone to succeed Belichick it would be Caserio, and while the coach will still be really important it will be the head of football operations who really matters in term of how the franchise is run.
If I were going to bet on anyone to succeed Belichick it would be Caserio, and while the coach will still be really important it will be the head of football operations who really matters in term of how the franchise is run.