I don't understand this. The 3DS is selling amazingly, and the Wii U is selling like shit, and Nintendo is called a failure. The PS4 is selling amazingly, and the Vita is selling like shit, and Sony is called a success. Don't they cancel each other out?
Anyways, it doesn't take 50m people to start a discussion. There are 9m Wii U owners around the world (as well as 52m 3DS owners) and a tiny, tiny fraction of those numbers is bound to end up on a forum. This isn't rocket science. There are plenty of other forums that have greater numbers in Sony or MS than Nintendo, this one just isn't.