They should definitely start with that, though. Because while that approach might've worked for the Wii, their new audience just isn't enough to save them this time.
The wow-factor is gone, so is the argument of low price (because the Wii U is still pretty expensive and I think those people, especially if they already own a Wii, are less willing to spend as much on a console), the gimmick isn't popular or, frankly, good enough to be as much of a selling point as it was with the Wii. So what Nintendo has to do is rely on both their old fans, those who've been with them in the previous generations, and the Playstation and Xbox crowd. And neither are really blown away by anything yet, either.
All the Wii U really has at this point, at best, are good games that you'd buy and have fun with if you already own the system, but not really much of a system seller. At least not for me, and I believe I'm not alone with that, even if some people might disagree and name Pikmin 3 as their personal highlight.
More power to them but, for me, as well as most of those who never even played a Pikmin game, that just doesn't draw you in, doesn't wow you as much as a system seller should. It might be fun, but it really doesn't give off that "MUST PLAY THIS OMG" vibe. Which is something Nintendo desperately needs. More than anyone else.
They need a gem, a piece of software, that sparkles so bright that it outshines even the most shiniest of graphics. Because the Wii U definitely doesn't have that going for it.