Well Sony had a helluva come back over the years to re-take second place and the original Wii kinda fell off the face of the earth the last yearish before the Wii U was out in terms of sales. The vita was hyped beyond hell on "the internet" and look what happended.
I think anything is possible. Being $100 more expensive does not help MS. The Wii U is the cheapest console on the market even with all It's shortcomings. If the Wii U doesn't do better this holiday I think it will go PS4>XB1>Wii U, but again anything is possible.
It's just that simple.







