I really don't think so.......
The baseline of Wii U is larger and WILL CONTINUE to be bigger after the holidays.
X1 only has the holidays to CONTINUOUSLY outsell the Wii U each year if it wants to overtake it globally.
Besides, the x1 is failing in EU without a new release of fifa.
Wii U can overtake the holiday sales gap of wii u and x1 throughout the first couple months of 2015 - as long as the release weeks also get tons and tons of sales.