Seems like an effort to create more "Pro Bowl" players. The player in the Super Bowl won't be able to play so alternates will automatically be promoted to the pro bowl squad, creating more Pro Bowlers, which creates more Pro Bowl jerseys to sell, and will increase regular jersey sales for those players as well. Also, like the Patriots last year who had players not play a week after losing, this will happen to two teams from the conference championship games.
Well thats my take on it; it has to be an economic decision, and I don't see many other reasons for it. I doubt the Hawaiians will give a shit that its 2 weeks earlier.