It will eventually end up as a pro league, for sure, but you can't limit NIL, even as pros.
IF the teams pay salaries and the players unionize you will have a DRAFT from high school, not recruiting, and the entire game becomes NFL-lite or a complete farm system.
Colleges are most likely going to end lots of sports because the athletic budgets are heavily fueled by revenue sports: football and basketball. Colleges cannot easily separate that their football team is a pro team but their wrestling team isn't....... BOTH will need to be paid teams or the schools need to get out of the business.
Be careful what you suggest because you can't go halfway. You can't suggest the school can "pick and choose" easily which sport is pro and which sport isn't.