In the NFL the top 10-20 or so players on each team make more than the head coach (depending on the team), and pretty much every starter makes way more than even the highest paid assistants. Hayden Fry said on many occasions that’s why he’d never go pro. He didn’t think a coach should play second or third fiddle to players or owners.
You have to deal with primadonna players, owners trumping your decisions to hang on to said players (Kraft, Switzer, etc.), and literally zero job security. NFL teams change assistants like underwear and if you’ve ever looked at the job history of journeyman NFL assistants they’ve been to more places than Metallica during the Black album tours.
If Bielema is ok with moving every two years and doesn’t want to become a head coach or coordinator he should be fine until retiring at 55. If you think about it it’s probably a load off his shoulders to blend anonymously into a crowd than deal with the shit storm that he had to put up with from Arkansas fans. But if not, he’ll find out pretty quick that a cushy college job will have more job security (still not great but better than the NFL), pay more over the long run, and offer more decision making than he will get now.
I do find it funny that he’s saying how awesome it is and how he’ll never come back, but he hasn’t even found out what his job is yet and hasn’t even coached in a game.