If I had control over Nintendo, I would let them keep doing what they are doing, BUT!..
- I would ask Miyamoto-san to please make Toad a playable character in all Mario spinoffs, where applicable (There are a great many games where Toad isn't playable, but should be..)
- I would make a club Nintendo for American gamers, with all the same benefits and other such things that the Japanese get.
- I would make sure that all Mario merchandise relased over seas is relased here (whether Nintendo is in control of it or not).
- I would take Miyamoto-san with me to see my friends (as another poster said he would do). They'd be so jealous.. :D
- I would have Nintendo make a sequel another Mario movie, this time one that is accurate, and maybe a Zelda and Metroid movie too (yes, I do know a Metroid movie is already in the works..)
That's really all I can think of right now.