The problem is that any buck spent on Nintendo games is not spent on breathtaking, future-proof videogames that can drive the industry forward. Nintendo is just a non factor now, the industry has realized that it needs to evolve and that Nintendo's gimmicks are toxic for it, but don't you remember the Wii days?
Those days where a lot of serious videogame companies disappeared because their games couldn't sell well enough because the casuals were all buying those WiiFit-WiiTrainer-WiiputHereWhateverYouWant pseudo games?
Imagine an industry ruled by Nintendo, with gimmicks everywhere, 2004 graphical quality in 2014 (that's what they're delivering with their WiiU) and people thinking that videogame players are just a bunch of nerds without social life. Nope, I don't want that.
Now speaking of the demos, could it be that they weren't running on WiiU's? The bird demo for example, while still below some last gen games like Uncharted 3, God of War 3, Gears 3 or Halo 4 it's well above anything the WiiU has produced and showed (the most offensive comparison is with Zelda, decent looking in the demo that had to be reworked from the scratch in a cartoonish style because the console isn't able to pull what they showed in real time), so is it possible that they put some kind of PC doing the job while there was a WiiU in front to fool the spectators? XD