I do find it a little funny that 4-player Mario platformer couldn't sell the Wii U last year, but this year, apparently with no price cut, another 4-player Mario platformer is somehow going to cause Wii U sales to skyrocket.
At $350 IMO this is a speciality item for hardcore Nintendo fanatics only.
Budget shoppers/parents/kids (groups that Nintendo usually has a chance with) will opt for the cheaper PS3/360 that have a far better library and a full roster of budget priced games.
That or the 3DS IMO which has more Nintendo franchises on it and costs far less.
Hardcore players aren't going to bite on the Wii U, they will ride out their PS3/360 until the PS4/XB1 become more affordable or appealling to those who aren't early adopters.
I'm just not seeing where the target audience for a $350 Nintendo console is. It definitely isn't the yuppie/casual crowd, they have the money to spend, but aren't going to spend it on "asymetric gaming". Their dollars are going to a new smartphone or tablet.
Im pretty sure 4-player Mario+Nintendo Land did sell the Wii U last year, it did 2.2 million in less than 2 months and is up there with some of the best launches. What they didnt do was sell consoles for the following 7-8 months. In that time the only exclusives released were Lego City Undercover and Game & Wario, most lego games have a strong brand name attached to them to help sales (Indiana Jones, Star Wars, Harry Potter, Batman, Lord of the Rings) this one didnt have that luxury. Injustice was the only multiplat released alongside other consoles and every other game has been a late port.
This holiday greatly increases the amount of exclusives and multiplats released on time. Mario 3D World, DKC Tropical Freeze, Wind Waker, Wii Party U, Wii Fit U, Sonic Lost World, Scribblenauts, Arkham Origins, AC4 Black Flag, COD Ghosts, Rayman, W101, Pikmin, Splinter Cell, Skylanders, Disney Infinity, Just Dance. Also even tho it doesnt have an official price cut it will have holiday discounts and bundles. U will probably be able to find Wii U deluxe with 1-2 extra games for $300.
When the herd loses its way, the shepard must kill the bull that leads them astray.