Instituting new policies or rules is never an easy venture. Humanistic nature has people conform to their set ways over time and then gripe when any change is proposed and eventually legislated. The growing pains of working with a new set of rules is initially a slog before everyone eventually adjusts and the language of the legislation is then changed once again.
This brings me to the welcomed change (for some) of the NCAA's policy on impending underclassmen getting their feet wet with the NBA draft process. From 2009-15, an appearance on the NBA's official early-entry list was enough for a collegiate underclassman to lose his college eligibility and be stuck with the fate of the NBA draft.