OOT3D has a bundle and no competition in the RPG or Advanture genre and the 3DS is selling well while Wii is well 400k behind this week.
Skyward Sword is selling better then Twlight Princess really
So it's selling fine nothing wrong with it yet.
TP was a launch title you can't compare. Following this path SS will have trouble to do 60% of TP.
So its going to drop like a rock next holiday? Wii numbers will be low but it won't be dead. Also userbase doesn't matter