Yeah but even the effort from Nintendo on the DS has taken a slide since 2005 or so. Still haven't seen games from them on par with Mario Kart DS or New Super Mario Bros. Even their amount of training games have taken a slide.
Nintendo just seems content. As long as they're making money off of every system sold, enough of their software is selling enough (which probably doesn't have to be much), and still collect royalties from third party software, I don't think they really care.
Still, Nintendo will probably put out another Zelda on Wii. I'd love it if they made a Mario Galaxy 2 but I know that just won't happen.