But my argument brings up the major reason there is little third-party support. It's a self-replicating cycle, wherein third-party developers don't make games since the console is not doing well since people don't have faith in it since Nintendo isn't showing it off well.
For any game that they make with a 3DS version (eg. Smash Bros), people have the option of getting the game for either console. Here, many people have a 3DS, but not a WiiU, so there is little impetus to get the WiiU. Couple that to the fact that the game is designed to be maximizing the power of the handheld, which is by nature less powerful than the full console, people end up underwhelmed by the console since it's working on a handicap.
Also, every game company is pushing multiplayer, which has seen a bit of resistance. Nintendo, however, is lagging behind in the online multiplayer, preferring local. This is a problem, though, which hasn't been seen in XBox or PS since online came out - you need a bunch of people over to play local. Great for kids with siblings or parties, but that isn't as common now. Couple this to the fact that Nintendo markets to kids, but its greatest audience is 25-35 young adults who have nostalgia going with it, and who don't have the ability to gather a group of friends together for local multiplayer often if at all.
If Nintendo were to push out some in-depth games like Zelda (which is a platform seller), a new Pokémon Snap (which people have been begging for), possibly a DK/Metroid/etc. platformer, or something of this like - all while making it so the graphics, gameplay, and controls are pushing the console to really show it off, then people will buy the console. And when more people buy, third-parties are more comfortable making games. And more people buy. And so it continues. The new Star Fox is a step in the right direction.
I really think Nintendo needs to make another game with realistic HD graphics, and really show off the WiiU.