Nintendo did consumer research, there are still people who use wii fit U  500k in japan to be exact.

I'm sure there are still people that are interested, but they seemed to be counting on this game to be one of their saving graces.  It was pretty obvious that it was never going to even come close to the sales of the original.  I think Nintendo chooses to ignore the tens of millions of people who got Wiis, played them for a bit, and will never pick up a controller ever again.

Nintendo cant be counting on something as their saving grace and doing nothing and not advertising the next minute. MAKE UP YOUR DAMN MINDS PEOPLE.

That's EXACTLY what they're doing.  They're the kings of sitting back and not advertising, thinking their products will sell themselves.  That concept sums up the entirety of the Wii U's existence so far.  And when they do advertise, they don't do it right.

Actually the issue is different: it's just that Ninty wants Wii U to cater for hardcores, and hardcores are happy to stay fat! It must be genetics, because at the faculty of engineering I know many people that regularly go to the gym, some even play rugby, but they're almost all fat! When they aren't it's because they are puny human larvae (often involved in boy scout or religious or nerdy sci-fi or fantasy associations, it looks like this helps preserving them in the larval state) and secrete the excess fat through their skin, particularly through monster-sized pimples that weirdly survived on their faces after they got past their teens. And when I had to resume working out after a skiing accident, and I swam one hour/day plus gym for more than a year, I remained quite fat anyway! Actually I never got thin even during military service, running 5km/day plus push-ups and other exercises plus marching. You can't win against genetics, might as well surrender immediately and stop suffering.   

Anyhow, maybe casual gaming isn't doomed, after all, but this doesn't prove wrong the Golden Law of D0m3: whatever happens, Ninty is ALWAYS d0m3d.