and Pikmin -

Nintendo needs to understand that quality in itself doesn't cut it. If you're not into the whole Mario stuff, it doesn't matter how well made a Mario game is, it's still Mario. It's like Tetris is Tetris, no matter how good the quality. Nintendo cannot keep reiterating the same stuff over and over if they want to broaden their userbase. Now, there's no denying that a new IP will struggle and real breakthroughs are rare with new things, but you have to try, that's what everyone else does. Of course the others have their annual surefire shooters and sports games to cover their experimental costs, but maybe Nintendo could do the same thing with their franchises and what winnings the Wii provided them? Why are they sitting on their asses? Or maybe it's too late? Maybe it's become a well established fact that shooters and cinematic stuff and whatever else is handled by the other two companies and Nintendo does Nintendo stuff? It won't be easy to change that perception.

Sure the Wonderful 101 is a new franchise but either it didn't appeal to average gamer or no one new about it (lack advertisement). Nintendo should try to address at least one of these problems. Either appeal and appease the average gamer or try to advertise your product more. The average gamer obviously either is not interested in the wii u ( price value, types of games, etc) or doesn't know (consumer confusion) how good it is. This is evidenced by the sales thus far..they suck hard.

Its going to take more than just nintendo games and the devs have made it clear its a shortfall.

I think some sort of rhythm/music game would be catchy. The amount of music instruments you can mimic on a touchpad is pretty large. Combine it with actual Nintendo tunes and it would be really funky. Like a cross between Final Fantasy TheatreRhythm/Wii music and Guitar Hero.

I can really imagine it already, and I think it would be amazing.  A FPS completely freed from any limitations of reality.  Levels could be verticle and made of floating platfroms, or in the sewers with pipe shortcuts, in the clouds where you could steal a Lakitu cloud for transport.  Platforming elements could be incorporated moreso than in standard FPS, with characters able to jump extra high, and being nimple moving from platform to platform could be a key skill.  Special items could mix things up, such as a micro-mushroom that would make you like Oddjob from Goldeneye, difficult to hit.  The standard Mario effects and themes could make things funny, like Mario shouting "It's a Mario!" when you get blasted with paint from behind by him.  Nintendo should really make this happen.

Wonderful 101? X?

A new or revitalized franchise that will push the system into the hearts and minds of consumers.  A DKC.  A Wii Sports.  NSMB.  Brain Training.  Something unique to the strengths of Wii U.  W101 was clearly not that, and while X could clearly grab a new audience for Wii u that isn't playing it yet, something that targets a broader audience would be nice.

Or bring back F-Zero from limbo, seriously Nintendo that IP has so much potential on the Wii U.

From what I understand, hasn't Nintendo said multiple times that they're making a new franchise? This will most likely be something that ends up on the Wii U.

I do believe that they need to cover areas that they don't already though. Action, FPS, and more older demographics-oriented games to broaden their fanbase and increase their overall variety.

Edit - Found it

http://www.eurogamer.net/articles/2013-07-10-nintendo-is-working-on-a-brand-new-franchise