Several reasons. Wii U version has been out for almost two months. The 3DS version of the same game has been out since mid September. The game isn't new anymore. Couple that with the move to Community and you're left with only a core group of users that's only going to diminish in number.
Huh, I didn't even realise the thread had been moved, no wonder I had to keep going into my post history to find it.