I think this stock's price is about right, or possibly undervalued. A massive percentage of people who obtained Wiis on launch day bought the Wii version of this game. The people who buy this version either did not want to wait for Wiis to be restocked, or they prefer the traditional controls. In other words, I think most of the people planning to buy this version had no interest in the other one anyway, so I don't think sales will be affected very much.
@SirVenom,
I own the Wii version but sold it to my brother because I decided to wait for the Cube version. However, I am in a vast minority amongst my friends--everybody else loves the Wii version and can't stop raving about how much simpler it is to use the ranged items.
I agree that it will impact sales negatively, but by how much are we talking? I wouldn't guess more than 15%, so either way the stock will be rising substantially from where it is now.
It will increase... As popular as the Wii version is, the GameCube still has a much much larger installed base at this point, so for anybody who doesn't plan (or isn't able) to get a Wii yet, this is the last great game for the system.
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