I think its way to early to tell how good the Wii U will sell. We dont know what games realease during Christmas, we dont have a price, we dont see how much the graphics will improved over PS3 and X Box 360.
And still one fact. Internet hype is not real hype. We saw that with the 3ds ( atleast in the first year) and we saw that with the PS Vita.
And also Microsoft and Sony have the oppoturnity to anounce a X Box 720 or PS4 this year. I dont really think they will give Nintendo a full year head start.