I'd agree that the success of Mature games on the Wii has not yet been established, however I don't agree that it's because it's demographic is just kids. The reason is too long to post in here, but if you really want to ask go ahead. A quick point though to counter that belief is that the 12 and under market is the smallest market in gaming, and if that was all that bought a Wii, it would have capped at 4 million sales and died.