Off the top of my head, currently the coaches have a really tough decision on some kids on whether to burn their shirt or save it for the next season. We've had dozens examples where the redshirt was burned and then the player had no meaningful plays, so it was a waste. Maybe there are kids who really really want to play during their true freshman year. You could put them in for a few games and maybe they'll see they're not tearing it up against college players and realize it's better to wait.
If we had this change, they wouldn't have to worry about it. If the kid contributed they'd decide it's fine to burn the shirt. If they didn't do a lot in the 4 games, then they would not burn the shirt. This year we could've given Gebbia a chance in the last 4 games if the coaches thought he'd play better than Lee or O'Brien. Or in 2009 we could've put Taylor Martinez in against Iowa State or Texas without taking a year of eligibility away from him. On the other hand our opponents could do the same thing.