People saying Nintendo should develop more Western-targeted content are...right. Completely right. This doesn't mean they should just develop them. Why should they? Make both your classic offering and brand new offering for Western audiences.
So far, we've seen lots of collaborations between Japanese third parties and Nintendo; they could apply, more or less, the same policy with specific Western devs. So far, it happened only with Warner Bros. for Lego City Undercover but...in the same vein of Bayonetta 2, why not Beyond Good and Evil 2? And that's the first example I come up with. Or, a brand new 007 game in collaboration with whoever has the license now. Since it's Western developers we're talking about, having exclusives of gigantic brands is impossible (with Japanese devs, it's far "easier"), so they should pursue the collaboration route here, as well as developing Western exclusives on their own.
Having Western-aimed content = trying to attract Western audiences. But they can perfectly continue their classic games, that would result in attracting far more customers, of different kind, which results in sales, and developers, and games, and audiences, and...
it goes without saying, doesn't it?
It could be a bit redundant for their classic audience, but I'm still shocked they haven't talked with Disney yet to create the first Disney classic...to play, not just to watch. A great collaboration between Japanese devs and Western directors (people like Bird and Lasseter), for a game that is marketed like one of the famous Disney Classic (like Snowhite, The Lion King, Aladin), but this time everyone can play. That's money, lots of them.