Mario Party. 1 million. North America. Where is my gun?
And people think Japan is casual heavy, but to put that in perspective Mario Party 8 will be at a 25% installed in american Wii's in less than 13 weeks of sales. To put it into perspective though Zelda should hit 2 million by New Years in NA. And Galaxy, Prime, or Smash (though late to the game) might beat them both.
What does this mean for the whole market?
I would cite regulation, but I know you will simply ignore it.