Yeah 2019 so far is looking fucking insanely good for the Switch.
Even just looking at the currently confirmed for 2019:
Travis Strikes Again: No More Heroes
Animal Crossing
Fire Emblem Three Houses
Pokemon
Town
New Super Mario Bros U Deluxe
Daemon X Machina
Yoshi's Crafted World
Luigi's Mansion 3
Then when you consider what else could potentially release in 2019 or haven't even been revealed yet:
Star Fox Grand Prix (assuming the rumors are true and it's real)
Pikmin 4 (miyamoto said back in 2017 that it was still in development)
Bayonetta 3
Metroid Prime 4
I think if Nintendo wanted to they could easily pull another 2017 and have a first party/exclusive game releasing almost every month for 2019, though I don't think they'll do that again even if they could.