The money isn't going away. Every new TV deal, and the salaries paid to coaches and ADs and league commissioners, shows otherwise. And people have complained about the quality of play for a couple decades now, since one-and-done became common. As for NIL money -- boosters and businesses may have to make some choices on whether to fund NIL or donate to facilities projects, but I expect the funds will keep flowing.
I don't love all the roster change, but I think ultimately fans care primarily about the same thing as always: winning. If your team is winning, you may be bummed when some guys leave the program, but you'll still be glued to the set to watch them play.