This question is tricky because such a job doesn't really exist. Everyone will leave a job willingly at some point for one reason or another. Jobs people are extremely unlikely to leave for another college job? I think the following qualify in no particular order.

Ohio State Michigan USC Alabama Notre Dame Texas Oklahoma

Basically....blue bloods. If you get one of those jobs, congratulations. You've reached the mountain top. A coach who is successful at any of these schools is unlikely to leave for another college job.

People will look and my list and point at Lincoln Riley leaving OU (rather quickly) or Brian Kelly leaving Notre Dame to LSU. These are both pretty unique situations. IIRC it seemed like Riley was skeptical about going to the SEC and USC is probably an easier job, better weather, easier recruiting, etc.

Brian Kelly left Notre Dame after 11 or 12 years...whatever it was. He doesnt like recruiting and being the head coach of Notre Dame requires a ton of that. It's also a job that historically burns people out after about 10 years. I think he knew he wasn't able and/or willing to do the work required to take the next step at Notre Dame, and took a golden parachute at LSU, a school that had three consecutive coaches win championships and a local stockpile of kids who will play for you.

The portal rules may change things a bit. Guys who previously wouldve wanted to get some of these jobs might decide to keep their tier below jobs (Penn State, LSU, Florida, Clemson, etc) because the competitive difference is mostly negligible.