For me I'd tell them to focus more on online gaming.
the only thing i'd say is really the biggest problem with the Wii: Friend Codes.
GET RID OF THEM NINTENDO!
I'd tell them to localize all of their old Fire Emblem games on a collection for the DS. Maybe work on another Star Fox game.
Seriously, the Wii and DS pretty much slimmed their big hitters down to Mario, Zelda, and Metroid due to narrowing marketing focus and development focus.
Bloody kids only know Marth and Ike from Smashbros.
Brawl Punching Bag
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PSN ID: Monsteroids
Yes FC are annoying I thought it was just me that thought that this was a stupid way of doing the friend system.