Every.damn.one

Just kidding I'm not that rich. Prime 4 is still being released this year though, and whoever it was that said I'm wrong will eat my foot. I'd bet anything that it won't be delayed to 2019

Buying:

Bayonetta 3
Metroid Prime 4
Travis Strikes Again: No More Heroes


Maybe:

Project Octopath Traveler
Pokémon Switch
Fire Emblem
Runner 3

Most of the above, assuming they all come in 2018 (some of which I don't see coming until 2019 at the earliest). The only two I am undecided on include LABO Robot Kit and Fire Emblem.

Definitely:
Smash 5
Pokemon
NMH:TSA


Maybe:
Shin Megami Tensei V
Fire Emblem

Bayo 3
Kirby
Mario Tennis
Yoshi Switch (if it's releasing this year)
Metroid
Smash Switch (if it's a thing and if it's releasing this year)

Definetly:
- Fire Emblem
- Pokemon
- MK9

Maybe
- Smash
- Octopath
- SMT

Someone convince me to buy a Switch...

Buy a Switch or a kitten will die.

Runner? That's exclusive? I don't know anything about the series but I assumed it wasn't an exclusive franchise.

Anyways, Definite Purchase:

Fire Emblem Switch
Octopath Traveler

If it comes out:

Metroid Prime 4
Bayonetta 3
Pokemon Switch
Smash 5

Mario Kart 5(definitely not happening this year...)
Shin Megami Tensei V(we basically know this isn't happening this year ...)

Might buy:

Kirby
Yoshi

Honestly a lineup of Octopath Traveler, Fire Emblem, and your choice of two games out of : Bayonetta 3, Smash 5, Pokemon Switch, and Metroid Prime 4 .... that would be EVEN BETTER than Switch's 2017 lineup! In fact, maybe even far better. Seriously, Octopath and Fire Emblem with two of those four games would be a great yearly lineup.

I'm really surprised you didn't put Animal Crossing though ... that's more likely than most of the games on your list.

Metroid, Ridge Racer, and Kart