The big issue for the Wii U , at least in Japan, is the 3DS.
The 3DS is a beast. The Wii U ? um... not so much.
I expect Wii U to splutter out the gates here and then splutter on for a year or so and then Nintendo will probably force everyone into buying the machine with a couple of titles like Advance Wars U, Metroid U, Yoshi's Island U etc....
and of course - a hefty price cut a few months before X8 and PS:Orb