That would be fine if Nintendo lived in a vacuum, but there are other factors, such as third parties who aren't pleased at all with the Wii.
And here's (mostly) why people ditched the Wii in favour of PS360 once they got bored of motion controls.
The paranoia over WiiU's specs* and online functionality is hope that Nintendo will try to take into account that these are what people ultimately turned to in the end.
EDIT: Just remembered as well, but lacklustre 3rd party support was apparently in part due to Nintendo games stealing the thunder in sells as wells? If I recall? Not sure if that'll be the case with WiiU again.
*AC3, ME3 and Arkham City are all great stuff in terms of recent additions. It's 3-4 years down the line that hopefully there won't be another Wii scenario.