They are also trying to make up for third parties. If there's real good third party support you can expect Nintendo not to release things so closely for causing competition, but there isn't now so they must make up for it. Nintendo still has a lot under their sleeves, even if they don't they're sewing new sleeves full of stuff (i.e. WiiFit idea, they might come up with something else). I think all their releases so far are good business choice.