The marketing is poor, but a "Wii" without a groundbreaking new controller interface (and no, slapping a touchscreen on a traditional pad doesn't cut it) was always asking for trouble.
It's Thanksgiving dinner without the turkey. It's a house party without any girls.
Fundamentally when Nintendo realized they didn't have a "new Wiimote" to drive the appeal of the system, they should've gone back to the drawing board, kept the touchscreen controller concept, but tailored the system more to the tastes of hardcore players, as they would need this audience moreso this time around.
It's not easy to pull a Wii Sports/Fit outta your butt every 3 years. Nintendo tried with Wii Music and was humbled and couldn't get Wii Relax (vitality sensor) off the ground.
Being in the "fad based" business is unpredictable, it's not like making a Mario or Halo or Gran Turismo where you know that audience will come back over and over and over and over again for years, even decades once you have the main formula down.
Nintendogs and Brain Training fizzled on the 3DS, Wii Sports/Fit likely have had their day in the sun too.
I think internally Nintendo is frustrated by the iOS/tablet/smartphone market stealing a lot of their thunder with the casual market and they are confused as to what to do now.
