They should reach into their pockets, buy 3-5 decent (western) dev studios next year and make them start working on some new IP's. Make Nintendo consoles absolutely a self-sustainable platform. Why have to rely on 3rd parties at all? 3rd parties dislike Nintendo platforms on the simple premise that they cannot compete with nintendo software. And that is good for Nintendo. Because you get most profit by selling your games on your platforms.
Keep moneyhatting capcom and other 1 or 2 large 3rd party studios into putting games which you cannot produce (like licensed sport sims or FPS). Keep the good relationship with indies that is forming with Wii U and the bih N has a winner.
For 2016 announce the first ever console that is able to push 4K graphics just to feel the salt from rabid PS4 and XBONE owners :)
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Essay Pro