Personally, I believe the problem is that they (publishers or Nintendo) thought they had another Wii on their hands.
The Wii, at least from where I stood through it all, was a bit of a fluke. A Tickle-Me-Elmo all over again. They were flying off the store shelves like mad, and when you knew a place that had one you found the money or went bankrupt trying to get it, but the software was bad. Games were so horrible I even bought that obnoxious Far Cry game for it! And this was all before the Virtual Console.
The WiiU just isn't going to put up the sales numbers like the Wii did, and probably no one else will be able to replicate it either. Like any other consumer fad, it comes and goes, never to be seen again.
Then again, I don't play my Wii and only have it for the bad Metroid Prime ports I bought (GameCube versions really were better). I don't particularly see the allure in having a gamepad when I'm single and live alone, plus owning an iPad and a Vita, not to mention money is short...
*sigh* Things can't keep growing! Somewhere, somehow, the money does stop. Just saying Ubisoft...