The NBA does have minor leagues - they're called the CBA, and the International leagues. :)\nSeriously - because viewers seem to value explosiveness over efficiency, I think we're seeing a major shift in the average age of NBA players towards young athletes that are quicker, high-flying and more resilient to injury. I wouldn't be surprised at all if by the end of this decade the average age of the league allstars is well under 25.
Why doesn't the NBA implement a minor leagues?