The SEC is a different animal. A lot of those schools have irrational, batshit crazy fanbases. Also, many of them have meddlesome monied boosters, with unrealistic expectations.
There are a lot of quality coaches in the league that aren't going to keep their jobs. I like both Lane Kiffin and Mike Leach. I don't think either is in a situation where they can win though.
Auburn and LSU are both hot seat jobs. If you coach at either of those schools, you're going to be fired. It's not a matter of if, but when. 9 wins, even 8 is usually good enough to stay employed at Tennessee, if you can compete with FLA, BAMA, and UGA. It's going to come with a lot of bitching and ridicule, but you can stay employed. It also helps if you are likable and don't come across as an asshole or aloof (McElwain, Moorhead, Derrick Dooley)
Also, never be the guy that follows the guy. Great coaches that are loved and go out on their own terms almost NEVER leave when the cubbard is full, and their replacements are rarely accepted and have a very short leash. (Ron Zook & Will Muschamp at UF)
Right now, the only coaches with job security are aren't first year guys are Saban, Smart, Stoops, and Mullen. Probably Jimbo short-term, due to his contract.
Tennessee is an interesting situation. The coup in the AD that led to Pruitt's hiring ensures they are going to do everything possible to help him succeed. However, there are some really big boosters that are laying in wait for that thing to go off the rails and they could try to make a swift move if the climate turns toxic. (something that I don't see happening in a covid season regardless)