I don't see him in another P5 job to be very honest. He's just not built for that and he would be a disaster at Tennessee to boot. He likes finesse teams with spread-option QB's and little linemen.
That doesn't work in the SEC (or B1G).
Plus, he's got a record of quitting now. He quit on Wisconsin and now he's quit on Oregon State. Who wants to take a chance on that?
Honestly I think he's done - mostly because he just wants to be done.