Unless Rock Band 2 is coming out on the Wii I don't know how much it will affect Rock Band sales on the Wii.
Guitar Hero: World Tour may affect Rock Band sales, but until we have a ballpark figure of how well this game will sell on the Wii I don't think we can speculate on whether 2 million is too high or not. Personally I think it likely that Rock Band will follow a similar sales pattern to Guitar Hero III on the Wii, relatively slow but steady sales for an extended period of time that add up to massive sales for the game.
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Unless Rock Band 2 is coming out on the Wii I don't know how much it will affect Rock Band sales on the Wii.
Guitar Hero: World Tour may affect Rock Band sales, but until we have a ballpark figure of how well this game will sell on the Wii I don't think we can speculate on whether 2 million is too high or not. Personally I think it likely that Rock Band will follow a similar sales pattern to Guitar Hero III on the Wii, relatively slow but steady sales for an extended period of time that add up to massive sales for the game.