I think there's some cool potential with the WiiU, but most will drop the ball as they did with the Wii. My main concern with the WiiU is that it has enough horsepower to get next gen ports from the next XBox and Playstation. I'll probably only get one console next generation and I'm a solid Nintendo fan. I dislike having to buy one console for the Wii exclusives and another for more serious games like Bioshock and Fallout.
The most intriguing aspect of the WiiU, IMO, is the ability to shift the game from the TV to the display on the controller. It's a lifesaver for married gamers whose wives get tired of watching them play, so instead of having to quit playing my game I now have the option to shift it to the controller display, pop in some headphones and keep playing. I can even take it into another room or to bed.