Flip side to the coin is that USA sales have outdid Japan+UK and then some. So Nintendo needs to raise their sales in those country's also, not just only in the USA it seems.
People just need to realize if Nintendo's gimmicks don't work/sell they do a 20-30m lifetime sales historically.
The Wii U's controller gimmicks have yet to amaze, so it's the same old song and dance for them. The Wii U's controller is as inspiring as a N64 or a Gamecube controller in the average consumers eyes. It does not have any of the appeal the WiiMote had to casuals. It will be a Gamecube/N64 repeat in my eyes for the Wii U, in fact sales are below those 2 for now and into the foreseeable future. It could change, but I wouldn't bet on it with even a dollar of my own money honestly.