Campbell is a good coach. I fully think he enjoys Ames and wants to stay there for the foreseeable future and build something. I figured he'd have 7-8 win seasons, maybe a 9 here and there and keep his status up for quite a while and eventually get an offer at a blue-blood which he'd take.
With how crazy this year has been and how crazy the season will likely be, I have no idea how ISU fill finish. If they keep improving, see above. If they struggle, I think he might realize taking a more lateral position/slight upgrade might be in his interest so he doesn't lose steam. Doesn't mean he'd take it by any means, but I think he takes it into consideration more seriously than he would have the last couple of years.
Having said that, I'd be very surprised if he isn't at ISU 4 years from now.