The PS4 is likely to overtake it in the next few months and has already overtaken wii u in UK and possibly mainland Europe. Xbox One is already half way to matching it. Not forgetting that the ps4 and xbox one are aimed at older gamers who tend to be able to afford larger purchases throughout the year.
In Europe the original wii still outsells wii u most of the time and may well go back to outselling wii u after christmas. That's without any real marketing and many online wii features being discontinued. So Nintendo are killing it off but still it competes well with wii u. The market is saturated with original wii's too.
PS3 is doing 3x the number of consoles as wii u in Europe.
It's clear the wii u numbers in Japan and USA are better but Nintendo can't afford to let the wii u become irrelevant in Europe. If they don't watch out it could be quite a niche product in Europe only sold in limited outlets.
