Do people actually still think that?
I think it's been pretty obvious since Splatoon's release that the PS4 isn't passing the Wii U in Japan until sometime in 2017.
So, that "ps4 is gotta close in on Wii U by the end of next year" seems a bit less realistic if the rest of the holidays will show similar comparative performances by the two consoles...
wait wait, this is the first (and only?) week where the Wii U actually shows being capable to beat PS4 post-price-cut. I could see the Wii U still beat the PS4 next week and maybe the week after, while with the new-year-week PS4 will be back on top.
The holiday boost for Nintendo will last 3/4 weeks, while PS4 clearly got a new baseline after the price cut and the release of some key title (such as MGS V
And while PS4 will clearly enter a better year, with way more key releases for the Japanese market and a full year at a lower price, the Wii U is entering a very weak 2016: there will be a way diminished Splatoon effect, of course; there will be even less software and in any case nothing that is able to appeal a brand new audience (unlike Splatoon and partially Super Mario Maker), if you consider that there will be Mario Tennis (January), Zelda remake (March, and LOL anyway), probably a brand new Zelda (that will attract zero new audience, imho, even if it will be "good" for what it is, today, in Japan, on home console.................) and nothing else.
The only game that "could" attract new people is maybe Pokken, but apart from Smash, I think that the beat'em up genre proved to be a niche genre in Japan recently (doesn't it?).
Plus, the Wii U is..increasing in price, unlike the PS4 (and any other console in history): the Splatoon bundle is more expensive than the MK8 one; the #FE bundle is even more expensive; the Pokken bundle is more expensive than a PS4 in Japan....
Not counting a possible NX announcement that, if it will be at least ALSO an home console, will clearly affect negatively Wii U's sales, of course.
So, on what are you basing your projection of Wii U VS PS4 LTD? They are separated by 660K on MC. The year will be made of 52 weeks more or less. That would mean for the PS4 to be able to sell an average of 12.6k units more than the Wii U. Do you really think that it's so impossible for the PS4 to do that?
I don't think so.