There shouldn't be one game per franchise per platform...
But... they have more than "The Triad". To plagarize someone else:
> Nintendo has Zelda (action/adventure), Xeno series (JRPG), Fire Emblem (SRPG), Mario (Platformer, Kart Racer, RPG, Sports), Pikmin (RTS), StarFox (Dogfighter, on rails shooter), Splatoon (TPS), Kirby (Platformer/Action), Animal Crossing (Simulation), Pokemon (JRPG), Metroid (Platformer/Shooter, FPS), Smash Bros (Fighter).
If they could release those on a regular schedule AND stoke the fires for 3rd party? And damn if being based on Unity won't kick THAT fire... They will own the next few years.