Wii U will probably have less innovative stuff late in its life cycle, which is sort of the secret sauce for how consoles reach staggering totals. SNES had semi-3D games late, PS1 had alternative sports games late (Tony Hawk was huge back in the day), PS2 had Guitar Hero late, Wii had Just Dance 2-3 late, X360 had Kinect late.
I think the safe bet for Wii U is 60m - 120m, with a higher attach rate than Wii. In most respects I think the Wii --> Wii U transition is going to be safer than DS --> 3DS, consoles aren't really under threat at the moment, and whatever threat they face, Wii U has a longer time to build up a base than the competition will.
People are difficult to govern because they have too much knowledge.
When there are more laws, there are more criminals.
- Lao Tzu
