We now have a semi-pro team in our community/area made up basically of former college and juco players. I can't believe the pay is very high. They are part of the NABL. The league started with 4-8 teams last year and has now expanded to about 19 teams with future teams projected to join in the next two years. if you consider the D league as AAA, this league would be high A / AA. the teams are located in major cities like Indy(the Indiana revolution - plays in Muncie), Dallas, Chicago, Detroit, Birmingham, Savanah, Atlanta.
my point is I can see minor league basketball developing much the same way independent minor league baseball leagues developed. And independent minor league baseball teams/leagues are becoming accepted as part of the minor leagues of baseball.
As independent leagues grow, I can see they might start including high school graduates. They already have former juco players. I can also see the NBA D league changing its rules to include high school graduates.