Nintendo will need to maintain substantial (meaning more than just Fifa, Cod, Madden and GTA) 3rd party support, and over a longer period if they want 3rd parties to get some firm roots on their console. They'll probably have to give some financial support for publishers for quite a while, til the userbase on Nintendo systems for those 3rd party games have grown enough to make it financially sensible (and I'm not just talking about breakeven here) to make their games for Nintendo systems.
It would require a big investment from Nintendo, but they could afford it. I'm not sure it would be worth it though, and I'm 100% sure they won't do it.
They'll probably get better Japanese 3rd party support next gen, but those don't push consoles along the likes of Activision's, EA's, Ubisoft's, 2K's and Bethesda's games.
