Wii, 200 million lifetime?

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so 200 mill Wii's and 80 mill PS3 and 360's would mean 280 mill consoles.. compare that to the 120 + 24 + 22 of the last gen, that's 166 mill, so that would mean the home console industry would grow around 75% this gen, I do believe that the industry can grow over last gen, but not 75%