I blame Wii Fit, Wii Fit opens 800k in the US Edition.

[konnichiwa]

If devs are thinking:

Dev A: Well what will we make for the Wii? A RPG? A adventure? A Puzzle Game?

Dev B: Why we don't make a party game that uses the Wii fit board! => Party games sell well, and it will be special cuz there will be not many games then that will the will feature the Wii fit board!

Dev A: Great idea!

Then it could damage real gaming though .....But I don't think many will think this way or I hope =p.