Of course someone else could have do better than this but this is Nintendo. They have limited power, they need collaborations to stay alive. Best they can do is Mario, Zelda, Animal Crossing from in-house studios, Fire Emblem/Warioware from Intelligent Systems, Kirby from HAL, SSB from Sora, and one project at a time from Retro and Monolith.
Rest is all collaborations, Traveller's Tales, GoodFeel, Alphadream, Platinum, Mistwalker, Team Ninja, Square-enix and Namco. Now they're going all in, all of their own studios and friend studios actually making something for the system. They're running on full power. Nobody's resting at Nintendo. I do belive this is the best they can do, 3D Mario, Mario Kart, Zelda and SSB are being made at the same time.