Neff
Member
None, no one game will "save" any system.
Actually, a FFVII remake, despite being an impossible cliche at this point, would probably do it.
If I was Iwata, I'd be trying to wrest an exclusive RE or MGS for the system, or maybe even the next legit Devil May Cry. If I were Nintendo-averse, I'd buy a new Nintendo console for one of those.
Realistically, it's going to come down to Smash and Mario Kart, and if 3D World is as good as 3D Land was, then it'll certainly be a big help. HD Zelda will literally do the business.
Nintendo's future strategy will probably lie in continuing to harness Japan's dev talent, an industry Sony and MS don't seem too interested in taking advantage of at the moment, and it's an ideal fit, since it's obvious Japan is terrified of committing to next gen budgets. Wii U will allow them to continue doing what they're good at, at a level they're comfortable with.