If there are really 16 new tracks for Mario Kart, new characters, new battle mode, they could even call it Mario Kart 9 and the press and public will eat that shit up.
"New nintendo console with a new mario kart at launch" you can already see the headlines.
Same for Splatoon. Add a game mode, something like 8 new maps, few accessories, call it however you want, it's done.
You're going to be disappointed and bitter. Launch and first year of a console are always shit and made of ports and rush jobs because devs couldn't have kits in time. Even Mario has apparently been started on Wii U. Zelda is a Wii U game they'll sell as a brand new Switch game.
On top of that it's Nintendo.