I'd say make Miyamoto president, but he's a game designer and not a businessman. If he were in management he wouldn't have time to design games anymore.
I'm probably going to get shot down by the extreme fanboys for this, but Iwata's business direction since the Wii has been extremely shortsighted. To me he comes off as a soulless businessman (much like most big corp management) who really doesn't know or care about video games, but how much money it makes. His (Japanese) Nintendo Directs also feel like cult brainwashing sessions rather than fireside chats. That whole part where he holds his hands up and emphasizes 直接！ is just creepy, and the thing is read off softly with no emotion.
On the other hand when you look over to Miyamoto you can just tell he has a deep passion for creating games and having people enjoy them. I genuinely felt bad for the guy when he admitted his failure of conveying the Wii U to people. I truly doubt, though, that it was his decision to put another DS style Mario on the Wii U. My suspicion still stands that management forced a rushed title out so they could rush the console out by the holiday.
