Nintendo is a hardware company. Saying they should put their games on iOS reminds me of everyone saying Apple should license OS X. It doesn't work that way.
I, of course, realize this. But I don’t view the situations as all that similar. Apple fell because it was mismanaged over several years. Nintendo has fallen because the world has simply changed around them very rapidly. (Remember how insanely popular the Wii was just a few years ago?) And it’s not going back.
They need to become the Pixar of the gaming world — another company which focused on hardware once upon a time.