This topic proves why Nintendo was important in the past, it doesn't say why it's still important today. Not as console manufacturer anyway, when it comes to software they are still important. Especially regarding local multiplayer.
I'd wish NIntendo would come with a really good new franchise that sells well that focusses on local multiplayer. These days developers think that games like Mario Kart sell well only because they are Mario games, but it's the local multiplayer fun that makes it attractive.