I have been completely wrong before, see the response on the Rant Board and ask my lovely wife, but I do not see CC leaving for Duke after Coach K, but he could be the second coach.
I think CC will begin owning Illinois. Corbi or others would probably know better, but I think a statement, "I got Northwestern to the NCAA. I can get you to the NBA and camps like Seth Curry's camp Why go across the country when you can come up the Edens." He is getting a palace. I would expect NU will give him leeway on recruits to keep him. He can win B10 and NCAA championship here and still live in a world class city. Pretty good life.
I just wonder on how he would like the anonymity. Folks will recognize him, but will leave him alone. He will get the adulation without the pressure, make a fortune, can build a program, and can make NU the go to program in all sports in Chicago It is my supposition that he is here for a while.
I also think the coaching he has done is much better than by FItz. You need 3 studs to get there. From the B10 games I have attended, missed Rutgers, I do not see us better athletically than other teams, but we have been so good at rebounding position, defense and pace of play. I thought BC was brilliant, but this staff in my opinion has won at least 3 more games than would be expected: