The gamecube failed because it was just like the Ps2 or the Xbox, but didnt have a DVD player. They decided to stop running for the power route, like they did with the NES, SNES, 64 and Gamecube, and instead went the gameplay way. Offer new way to play games. The wii was very successfull on that regard, and the two competitor had to stop and turn around to go the Wii way. Now with the Wii U they added a new gameplay option, the Gamepad. I have no doubt that the Wii U will have more unique exclusive than the other two.