This would add an extra dimension of realism to us dynasty junkies. Wouldn't be hard to implement IMO. This way you could over sign players past the allotted 25 without having to cut players. Any over the allotted 25 could either get a redshirt or greyshirt as in real life. All greyshirts would count toward next years class number.
IMO, this would eliminate the option for cutting players. Although it's not completely out of the realm of possibility, it is however, a rarity for scholarship players to get cut. Furthermore, you never hear about a school cutting scholarship players just to fit a class into the allotted number of scholarships. I just doesn't happen. But in EA's NCAA series, you either find yourself cutting players every year, or as I do, only recruit the numbers I need.
Adding greyshirts fixes this IMO.