This is just silly.
Firstly, we only know a very small proportion of the Wii U's gaming library. Obviously it won't just be Kirby, Mario and Zelda.
Secondly, Nintendo can't hope to replicate the Wii's success with the Wii U. If they went the same route, people would think "what's the benefit in this? I can do all of this with my Wii!" and it wouldn't sell to that audience at all. The controller screen is an interesting idea, and it could work very well. It will certainly work better than just duct taping together two Wiis.
Thirdly, Sega was in a mess when the DreamCast launched, and they were up against competitors in a very strong position with enormous amounts of money to spend.
Honestly, I can't see the benefit in the Wii U the way it is. The console is basically just a system for third party ports while everything else stays the same or goes backwards for me. Aside from the obvious higher processing power in the machine, of course.
Nintendo haven't showed the killer ap yet because they don't want to give Sony an opportunity to copy it with vita. Nintendo only release hardware when the current hardware can no longer realise Miyamoto's genius. Wiimote was released with the GameCube slim for Wii Sports, BB for Wii Fit, Wheel for Mario Kart, M+ for WSR and 3DS for Steel Diver and Face Raiders.
Why would you doubt Nintendo?
OT: Wii Sports U Resort Online HD isn't going to sell WiiU either, neither is Wii Fit Plus U Online HD or Brain Training DSiXXXXL or Nintendolphins.