Interest slowly fading has already started. Unless you're a fan of the select few schools with nearly unlimited resources, you've got no shot at your team competing at the highest level regularly. Spend some time talking to the fans of other schools and you'll come across a lot of people that are already caring less about college sports. The problem isn't that the players are allowed to be compensated for their NIL. Instead it is unlimited free agency, stealing players from schools by throwing more money at them, no salary cap, and players being paid as part of recruiting. The concept of NIL was supposed to allow players in college to make money for doing ads, making appearances, and selling products with their name or face on it. It wasn't supposed to be someone giving a player $4MM just to come to their school.
As for this court ruling, how long until the NCAA's "limit" of 4 years of active participation is ruled to be against the law? Only a matter of time. Once that happens, just shut the NCAA down as they provide no value other than scheduling end of season tournaments and maintaining the in-game rule books.