The reality is he has won only 4 NCAA games in 10 years as a head coach. Never gotten to S16.I think if you fire an otherwise successful coach over postseason struggles after 7 years; then hiring an established coach might be difficult.
Coaches who recruit well, regularly win 20 + games, compete for conference championships, and make the NCAA tournament consistently generally are not fired unless it is for gross misconduct.
He has a monkey on his back and if he wants to keep a job with a top 10 salary in the country he will need to break through.
Nobody would question if they parted ways and claim Illinois has ridiculous expectations.