Prediction: Christmas 2014 will determine if WiiU will perm be in 3rd place by the end of the gen.

[Dark_Lord_2008]

PS4 is selling on average around 1,267,000 per month after 6 months for a total of 7.6 million.
XBox One selling on average around 767,000 per month after 6 month for a total of 4.6 million.
Wii U selling on average 344,000 per month 18 months for a total of 6.2 million. 6 months since its November 2013 launch the PS4 has sold a staggering 500,000 per month more than the XBox One. The PS4 has sold over 923,000 per month than the Wii U.