one more thought: i've argued with a bunch of people on this but i still hold my original theory that the initial and relative price point of the Wii had a lot to do with it's success, and since i believe in that I must also believe that once the 360/ps3 go under the lowend pricepoints they could have the chance of mass appeal. Then again they aren't marketed as something brand new so there's that psychological "it's new" thing to consider...
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