Honestly I really don't even care if the Wii U sells only 35-40 million units versus the 100 million the Wii sold.
That extra userbase on the Wii was largely driven by people only interested in Wii Sports/Fit/Carnival Games/Just Dance type stuff and maybe a little bit of Mario Kart/2D Mario. As a result the Wii library was flooded with a bunch of casualware crap and the third party support was never that great.
I hope they don't come back to be honest, so Nintendo can just focus on core gamers and maybe even try making new core IP instead of chasing the next silly non-gaming fad. Let that be the domain of the $1 iOS app, because it seems like casuals found their ideal stomping ground with cheap/free software to occupy their 10-15 minutes/every other day urge to play something.
PS3/360 ports maybe not be anything to go crazy over, but I'll take Need for Speed U and Arkham City for the time being over Red Steel 1 and Soul Calibur Legends.
Having to basically support the Wii U on their own will force Nintendo to seek out more developer alliances (ala Platinum Games) and/or expand their own internal resources like the N64 era, so I'm fine with that.
I think in a lot of ways, Wii U will just be a transitionary piece of hardware until Nintendo can release a real tablet platform that's a portable/home use hybrid.
