They're starting to see the simple math. There are just so many people who own a Wii and the demand is still so strong that there are going to be so many more. If you make a good game you're going to get solid sales, and those are going to increase to great sales as the amount of people who own a Wii increases.
My Games of 2011:
The Legend of Zelda: Skyward Sword
Elder Scrolls V: Skyrim
Super Mario 3D Land
Uncharted 3: Drake's Deception