If they lose some points and gain some defense, I'd take that trade any day. BYU will never get anywhere until they can play D. Hawkcat will appear on this thread to explain how they're losing too much offense, but if there's more of a rounded team effort on O instead of counting on one guy to go off, and they improve D, I'd take that any day.
BYU will find a way to score, Haws or not. I'm more worried about replacing other aspects of the game. No offence to him and what he did for BYU.