I feel like they probably should, or at least one every 3 weeks. Definitely give us something to play every month on a single platform.
Barring any other partnerships, I see this as Nintendo's max output in 2017:
- Breath of the Wild
- 3D Mario Switch
- Pokemon Stars
- Splatoon Switch
- Smash Switch
- Mario Kart 8 Switch
- Mario Maker Switch
- New IP from EPD
- Pikmin 4 (or another new IP)
- Mini-game/demo collection
- Mario Sports Superstars (3DS port)
- Retro's game
- Other game Next Level is working on
- Game from Intelligent Systems
- Ever Oasis (might as well port this one up too)
3rd party publishers:
- Mario/Rabbids RPG from Ubisoft
- Pokken Switch Edition
- Hyrule Warriors Port
- Mario & Sonic at the Winter Olympic Games
I do think they'll have a few other partnerships up their sleeves for stuff and probably several of the games I listed will be 2018. Obviously they could have several eShop-level titles on top of that, Gamecube VC, Mother 3 digital release in the West, etc.
2018 would be Monolith Soft's game, Platinum-developed title (I think they're booked for next year already), probably Fire Emblem, Animal Crossing, next Mario Party, and maybe another new thing or two. Sakurai could possibly have a new project ready if he's not working FT on the Switch Smash port.
Basically without the "Championship Edition" ports they won't be able to sustain a game every 3 weeks. Luckily they do seem to have some 3rd party support lined up and indie support looks to be strong.