"If you want to look at what Disney can do for a character, look at the mainstream's acceptance of Iron Man."
Eh? The first Iron Man movie came out a whole year before Disney bought Marvel, and they obviously already had the whole Avengers thing in mind, considering the post-credits scene. What the hell is this guy talking about?
Anyway, I'm not sure if Disney buying Nintendo would be benefical. It was good for Marvel, we're yet to see how it works with Star Wars, but the problem here is that Disney doesn't give a flying fuck about video games. Hell, they shut down Lucasarts after all. It's likely they would withdraw from the hardware market and become a third-party developer - and only focus on the big hits anyway (Smash, Zelda, Mario and Pokemon basically).
That being said however, I believe it would be EXTREMELY benefical in the movies department. We'd probably see pretty good movies based on several Nintendo IPs - and in this case, it's likely that they would use the lesser known franchises (look at Big Hero 6 for example).
