Eh, I'm not gonna go so far as to imply he ran away from competition, but you have to consider he's in his 70s and navigating the massive sea changes in CFB was probably not something he wanted to do at his age. If he was 10-15 years younger? Sure, and I'm willing to bet he would have still won big.
I just don't believe this narrative that no one except Bama was paying players under the table. All of the top SEC, ACC, and B1G programs at a minimum were. Saban was the difference maker. If I was a 5* kid and was going to get paid either way, I would have went to play for Saban because he got them paid in college and got them paid in the NFL. Alabama has a been a machine churning out draft picks over the last 15 or so years.