It's Dr. Vita, every thread he gets the chance, he attacks the Wii U cause, without evidence, he hates the console. Since a certain term here is banned, that's as far as I will go on that side.
But Lol, really Dr. Vita. Vita will be 3 years old THIS month. 3 years at 9.8 million is bad, like really bad. The Wii U will turn 3 years old later this year after heavy hitters are out. Chances the Wii U will hit 13 or 14 million is actually really high this year. Big titles, DLC which is still coming out, and a heathly stable of first party high quality titles.
The games on my head this year for Wii U are:
Project Cars, Kirby, Legend of Zelda, Xenoblade Chronicles X, Lego Jurassic World (I enjoy the lego games), Star Fox, and generally any other side project they have that interest me. I have Mario Kart 8, and Hyrule Warriors, both have DLC coming. Smash has Mewtwo, and if they do more content like the free 8-man smash stage update (which made 15 more stages playable in 8 man smash).
Just because China is getting the Vita doesn't mean it will sell well there. Japan is a mobile culture, China is like us, so they may reject it as much as we do here. Considering you can buy a Wii U in China on the gray market says a lot too. In China, PC gaming has always reigned supreme