I'd say 4 major (semi-)exclusives, one per quarter like 2017: Breath of the Wild, Mario Kart 8 Deluxe, Splatoon 2 and Super Mario Odyssey. 3 is OK, but that's the minimum. Games like Pokémon, Super Smash Bros., Animal Crossing, 2D Super Mario, 2D Zelda, Donkey Kong Country and strong new ips. Maybe Mario Party too, if it can reach MP Wii / DS numbers.
With 6-8 games that are not best-sellers (1-2-Switch, ARMS, Mario+Rabbids: Kingdom Battle, Pokkén Tournament DX, Fire Emblem Warriors, Snipperclips and Xenoblade Chronicles 2 for 2017).