But that gets you into the Robert Swift dilemma. It is difficult to know which high schoolers are average and which are superstars because, in addition to their young age, the level of competition across the country is not the same and AAU isn't great for recognizing play within a team. So it is extremely difficult for NBA scouts to accurately evaluate talent with all those variables. The 1 and done rule at least helps level the playing field during that one year. Not having that screening system increases the likelihood of errors.
The other thing that I can't figure out is whether a large expansion of the G-League would work. Minor league baseball works because most people go to a minor league baseball game because of the general relaxation and social experience of going to a summer baseball game, not because of the on-field product. I am currently a bigger NBA fan than MLB fan and have NBA season tix, but I go to minor league baseball games all the time and I don't see myself really ever going to a G-league game. If the G-league is not self-sufficient then the NBA would have to subsidize it, and I'm not sure I see the players union going along with that.