When you consider that the PS3 and 360 sold about the same amount of consoles, the fact that PS4 is taking a big turd on Xbone this time around leads to the obvious conclusion that the Xbone is and will be an abject failure. The same can be said for Wii U in relation to Wii sales.
Contrary to the opinion of the OP I think Wii U and Xbone sales will be comparable for the next couple of years at least. And Seece, please spare us from this sold/tracked/shipped argument from now on we're over it...