Love him or hate him, Mark Cuban's assertion that the NBA needs a minimum age limit is right on.
I would add to his position that it also addresses the issue of education and the NCAA, which honestly doesn't give a shit about degrees, only the business. For every kid that quits school to play in the NBA, how many really rise to make a long-term living of it? And of those, how many have nothing to show for it?
The idea that "they could get hurt before they go pro" is a bullshit cop out. You want to be a professional? Get a degree, then play.
The NBA does not need an age limit... just an educational requirement. If a normal employer can require at least an associates degree (2yrs college), there is no reason why the NBA can't do the same. This is the same as requiring an age limit w/o saying it is an age limit (which is in the collective bargaining agreement).