a little bit isn't enough for most of the teams that will want to hire him
This, remember when Belichick got fired, and his agent put out all the teams that were interested in him in the media right afterward.
He got 1 (one) interview, and Arthur Blank decided he'd rather run it back with Raheem Morris, Terry Fontenot and Rick McKay (and the results were completely predictable)
An owner's preference is always going to be a good coach, who got a raw deal in his prime (this cycle, a Stefanski), or a young coordinator they don't have to really pay for a while.
I could see Mark Davis rolling the dice on him, but he's now paying a 4th head coach, and they just fired Pete Carroll. Maybe Stephen Ross fires McDaniel for him? Does Harbaugh turn the Dolphins around? I dunno. If Buffalo's one-and-done, maybe he goes there?
Wherever he ends up (and it's going to be a head-scratching situation he ends up in), just temper your expectations.
My only caveat to this line of thinking if he were going to get fired (and probably won't now) is Tomlin, and he's like 5 or 6 years younger than Harbaugh.
(I also don't think either of them are great coaches - great regular season coaches, yes)