What does "save" actually entail? Selling the most units? I think it's pretty clear that Nintendo will never outsell Sony in the home console business. Wii was more of ananomoly, and even it will barely edge out the PS3 despite being home to several sales phenomena and Sony cranking out its biggest console disaster ever.
But it looks like Wii U should easilly outsell the Xbone, and looks to have a pretty solid library, so what exactly needs saving? You could argue the profitability factor, but I believe Nintendo recently announced that they now receive a profit on Wii U sales (albeit a small one). Mario Kart 8 was never single handedly boost Wii U sales to the top. No game will though. It's just a matter of pushing momentum, and Mario Kart certainly achieved that.
"We hold these truths to be self-evident - all men and women created by the, go-you know.. you know the thing!" - Joe Biden
