I just see this in a different light. There have always been kids that sign with Nebraska that don't work out. Collins Okafor jumps to mind -- good prospect at RB, never materialized. It was obvious that he wasn't going to break the rotation after his second year, but he stayed around on scholarship for another three years. He didn't transfer - he just ate up a scholarship. When someone doesn't work out at Nebraska and they transfer because of the current rules, is the football team better off or no?
You can say "good coaches make players fit" which I really don't agree with. There are different ways to get people to do what you want, but the 20-60-20 rule is almost universal. In an given organization, 20% will excel no matter what management does. 20% will underperform, even if they excelled in other organizations, for many reasons that may not be under the control of management. Good managers 'help' the middle 60% follow the top 20%.