It's really Angry Birds vs. the void left by the death of licensed movie and kids games. This is a good thing. The decline of Nintendo hardware sales look pretty bad for retail numbers but we all know how Nintendo was the only company reaping any benefit, 3rd party Wii developers suffered.
Unless we're talking Nintendo's franchises, in which case the price will stay exactly the same until at least 5 years later when it gets put into a classic series...