Except real leaders stand up and say to those pansy entitled kids, "Fine. We're having a football season and if you're not present on the first day of practice we will understand you have chose to surrender your full scholarship and we will offer that scholarship to another student athlete. If we have to delay the season a month to finalize our rosters, we will. If we have to essentially revert to a club sport, we will. And you will matriculate elsewhere."
If all Pac12 presidents had the balls to do that, you'd have a handful of rich white boys take a stand to make a statement, but most players would return. Leaders don't let students run their universities.