Willing to take the pounding if/when... In fact I'll bump it to the front to remind all of you for your convenience.
I have no "great source", but I am giving the notion full consideration with a complete disregard of any/all things RR related. Just focusing on JH and what any aspiring coach would want.
Harbaugh may have relished the notion of coming to AA at one time, but 2 things have happened:
1) A #4/#5 ranked team w/ an 11-1 season - He truly has nothing left to prove in NCAA life. He's done it with all the "limitations" (i.e. academic standards, disinterested fanbase, etc) he deals with. Toiling 2 to 4 more years at UM towards the only remaining goal (Nat. Champ) is futile
2) The NFL - It's not going to be just the Bills and Raiders this time. There will be too many, to not find the "perfect one" and forget all about UM. Likely SF. He can stay in his beloved West Coast area, make WAY more $$, have a new set of challenges, follow the footsteps of his brother and Bill Walsh, etc.
It's not going to happen, with or without RR.