For the players like Ndudi Ebi, Kwame, Dorrell Wright, it'll expose how unprepared they are for the league, which benefits the NBA not the NCAA
Good soo they get to keep them and develop them. This rule benifits NCAA too because example Rudy Gay was sopouse to come out last year but he knews if he stayed one more year that team would be his, not Charlie Villanueva's. He stayed and helped his stock. players will stay.