The Harvard Gazette offers a timely discussion of Michael McCann's research on the fate of high school ballers entering the NBA draft. McCann's study (which I mentioned earlier here) debunks the myth that high school draftees as a class suffer either athletically or economically. Even Korleone Young, the poster-child for failure ("for every Kobe Bryant, there are three Korleone Youngs"), makes a decent living playing in Europe these days. Most do far better.
McCann states in the article that a rule which bans high school players from being eligible for the draft could be successfully challenged as an illegal group boycott. Well, a group boycott is certainly what the NFL has done with Clarett, Williams, and other young players with the talent to play pro football.