Remember 'X' footage we saw was just an early build, once we see the whole game in action then we should see a significant spike in sales.
While it is mostly the third party's problem for lack of games (Cough..Rayman...cough..EA), it's been quite poor of nintendo considering that we were meant to get at least Pikmin 3 and Wonderful 101 and launch, 4 months in and still no sign. I think most people aren't really worried about the colonial marines port thanks to the bombardment of bad reviews on all the other platforms.
Hopefully Nintendo is saving for something big because there going to have a lot of competition to face with PS4 and 720 most definitely going to make an appearance.