Rare: They've been in decline for years so I don't see Nintendo getting them. Plus MS owns them
Monster Games: Reasonable idea since they've been working with Nintendo for years
Silicon Knights: Again, they've just gone to hell, mostly due to Dyack's hubris. Too Human was better left dead.
Sakamoto: I would like to see him on more projects
Q-Games: Can't argue there
Grasshopper: Might be a little too crazy for Nintendo...and that's saying something
Next Level: Yes, their new Punch-Out!!! was GREAT
Kuju: Maybe