The Wii was a unique event in gaming history that will probably never ever repeat itself(Much like the DS).
It's all about the novelty. Before Wii there simply was no motion control, nobody but Nintendo did even think of it. It hit the right spot with casuals, thanks to great marketing as well. Much like the DS which was also something completely new and unheard of and not to forget perfectly implemented.
WiiU is no novelty. Sure there is a touchscreen in the controller but that's something people already got in their smartphones and tablets. There really is no benefit for the mainstream consumer to get a WiiU because in the last 7 years they got different means of playing their casual games. Tablets and phones are more volatile and the games are considerably cheaper. There is just no chance that the WiiU could replicate something like the Wii.
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