Hard to compare transfers from 10-15 years ago to the current environment in college basketball. Players are quicker to transfer today if they are unhappy or don't get PT. It's like saying Coach K must be doing something different now because his players are now turning pro where 15 years ago no Duke player left early.
Plus, it's hard to label Deangelo Alexander as a "transfer" for basketball or team related reasons.
You can remove Alexander and replace him with prince fowler. Still a very good coach but his transfer attrition was much worse in terms of talent than Lon’s.