Could Xbox have realistically won any of their generations? Why/why not?

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Soundwave said:

The only one they really had a shot with was 360. Maybe if they had launched Kinect earlier (say 2007) to cash in on the casual motion gaming fad earlier they maybe could have stolen some more sales from the Wii.

Kinect would never have been made without the motion control explosion happening first, and as something like that takes considerable time to develop, there was really no way for them to have it out back in 2007.