There should be academy league with every 2 game changes, like picking random players, if someone overperforms all the time maybe keep, it would be good for new talent scouting, I don't see a point keeping Academy players that long and trying to rise them.
Should be so entertaining and good for CS scene. What is the point of keeping for example Demon in Navi Junior? Will he become a star? No, is there better players In Ukraine even his age, ofc.