That was an interesting read. I honestly think the Wii U is well equipped to handle both casual and core gamers.
In all honesty, the biggest problems with Wii were the online and lack of good in system advertising for games. The Wii had quite a good number of well implemented control schemes, it had some extremely good exclusive 3rd party games and it even some of the multi plat games were actually better on the system.
The Wii U will have all of that, a vastly better online set up, (I'm speculating) even better then 3DS's eShop in system advertising (which the 3DS's eShop is doing phenomenally well and has improved sales for DSiWare games), a completely new and awesome control scheme, much stronger media features, and of course it will be drastically more powerful with HD visuals.
I don't doubt the Wii U will do well, the question is will it sell more or less then the Wii did?