I wouldn't say it's doomed. Just that the Wii U hasn't yet given consumers enough reasons to buy.
The average gamer and consumer looks at the Wii U to be on par with the PS3 and 360 in graphics. And the only real difference being the controller with the mini Ipad in the middle. Most of the launch games were already out on the PS3 and 360 and didn't take advantage of the Wii U controller.
But the good news is that those problems can be fixed. And Mario and Zelda have a large fan base.