The Chargers and Falcons are interviewing everyone with any head coaching potential right now. Jimmy seems to be in the mix for both. Bill Belichick has met with the owner of the Falcons and has a 2nd interview this weekend.
The Michigan situation seems to be at a stalemate, why would you let your National Championship coach interview with multiple NFL teams otherwise? Saban retires and half the SEC head coaches get new contracts in just a few hours.
Believe it or not, I don't think the last few seasons the NFL wanted Harbaugh. He is 60 and runs a old style offense which doesn't seem too NFL friendly.