I think it's more likely (but not actually likely) that it goes the other way, and basketball switches to a model like baseball, where once you start college you have to go for three years. High school basketball players could enter the draft, then decide not to go pro, but lock themselves into college for the next three years. (Or two at a JUCO.)
I think that's a better solution, anyway. I don't really understand why it makes sense that an 18-year-old's ability to earn a living playing in the NBA can be collectively bargained away by a group that player's not a member of. A minimum age helps college teams, but I think there's been some pretty substantial research that players develop faster in the NBA than in college.