Nintendo's release schedule is pretty crowded for 2017. I can see Retro's game getting bumped to 2018, especially if they have another big title ready for 2017 (Pokemon or Smash). Even if they don't have another big game, they may not have a big open window for another major 2017 title.
Crowded? I don't see that in the slightest. Until they announce a lot more, it's not even up to par with their last 3 home consoles. At least numerically; quality is subjective, but obviously Zelda is the best possible start.
Look, here are the games from the 1st 12 months of their last 3 home consoles:
Gamecube:
Luigi's Mansion
Wave Race: Blue Storm
Pikmin
Super Smash Bros. Melee
NBA Courtside 2002
Eternal Darkness: Sanity's Requiem
Super Mario Sunshine
Animal Crossing
Mario Party 4
Metroid Prime
Star Fox Adventures
Wii:
Wii Sports
Excite Truck
The Legend of Zelda: Twilight Princess
WarioWare: Smooth Moves
Wii Play
Super Paper Mario
Mario Party 8
Big Brain Academy: Wii Degree
Pokémon Battle Revolution
Mario Strikers Charged
Metroid Prime 3: Corruption
Donkey Kong Barrel Blast
Battalion Wars 2
Fire Emblem: Radiant Dawn
Super Mario Galaxy
Link's Crossbow Training
Wii U:
New Super Mario Bros. U
Nintendo Land
Lego City Undercover
Game & Wario
Pikmin 3
New Super Luigi U
The Wonderful 101
The Legend of Zelda: The Wind Waker HD
Wii Party U
Mario & Sonic at the Sochi 2014 Olympic Winter Games
Super Mario 3D World
NES Remix
Nintendo has, what, 10 Switch games released and announced combined at this point? And don't say 3rd parties, because the Gamecube and Wii had plenty of 3rd party support. Right now, the Switch is tracking to maybe equal the Wii U until more games are announced for release within its 1st year.