Why not the G-league?

Baseball player routinely go to the minor leagues. It is rare for anyone to jump directly into the majors, whether he comes out of high school or college. Why not have a minor league for the NBA and use it like MLB does? How is that wrong? If the players are good they eventually find their way to the major leagues, and their progress can be speeded up by the home club. I think it is a good idea that will allow players to be in college that want and need to be in college, instead of creating malcontents who disrupt the process.