Sports leagues have been exempt from antitrust legislation for more than a century. Good luck with that court battle. The NFL, NBA, MLB, NHL, and NCAA will throw more $$ at that court battle than you can imagine. That will never change.
And most of these kids we are talking about go into the NFL and NBA as soon as they are eligible. They are only playing in the NCAA because they aren't eligible to play in the NFL and NBA sooner.
So you tell me, how much is an 18-year old kid who isn't eligible for the NFL or NBA draft really "worth"? In other words, outside playing in the NCAA, how much could they make? And if it is a significant amount of money (with more than their scholarship and NCAA perks give them), why aren't they doing it?
And congrats for being the umpteenth person to talk about how much these kids make for the NCAA, but then completely ignore how much the NCAA schools spend. It was sourced above - 88% of NCAA programs operate at a loss.