Here's a full-list IP wise for Switch:
Nintendo Forever IP - IP (and sub franchises) that get games every generation and got a game on Switch
- 2D Super Mario
- 3D Super Mario
- Mario Kart
- Mario Tennis
- Mario Party
- Paper Mario
- Mario vs. Donkey Kong (remake only)
- Donkey Kong (port only)
- 2D Zelda (remake only)
- 3D Zelda
- Metroid Prime (counting spin-offs)
- Yoshi
- 2D Kirby
- Spinoff Kirby
- Mainline Pokémon (both new titles and remakes)
- Pokémon Mystery Dungeon
- Miscellaneous one-off Pokémon spin-offs
- Super Smash Bros.
- Fire Emblem
- WarioWare
- Pikmin
Nintendo Mainstay IP - IP (and sub-franchises) that get games in most console generations, but do sometimes miss a generation
- Mario Golf
- Luigi's Mansion
- 2D Metroid
- Picross (this is a Nintendo IP, but licenced out to Jupiter)
Nintendo Younger Generation IP - IP (and sub-franchises) that have perfect records so far for generations, but are still on the newer side (Wii era or later)
- Mario & Sonic at the Olympic Games (technically a Sega franchise)
- Captain Toad
- Super Mario Maker
- Hyrule Warriors
- Pokkén Tournament
- Detective Pikachu
- Tokyo Mirage Sessions
- Xenoblade
- Splatoon
- Nintendo Sports
- Brain Age / Brain Training
- Miitopia
- BOXBOY!
- Bayonetta (not Nintendo owned, but included for completeness)
Nintendo Revived IP - IP (and sub-franchises) that have gone a long time without anything back on Switch
- Endless Ocean (last active on Wii in 2009)
- Another Code (last active on Wii in 2009)
- Advance Wars (last active on NDS in 2008 - 2013 in Japan due to late release of Days of Ruin)
- Mario Strikers (last active on Wii in 2007)
- Big Brain Academy (last active on Wii in 2007)
- Clubhouse Games (last active on NDS in 2007)
- Cruis'n (last active [on consoles] on Wii in 2007 - this is a Nintendo IP, but licenced out to Raw Thrills)
- Baten Kaitos (last active on GCN in 2006 - not a Nintendo IP, but Nintendo has some ownership)
- F-ZERO (last active on GBA in 2004)
- Pokémon Snap (last active on N64 in 1999)
- Famicom Detective Club (last active on Satellaview in 1997, or GBA ports in 2004)
- Super Mario RPG (last active on SFC/SNES in 1996)
Nintendo New IP - IP (and sub-franchises) that got their start in the Switch era (not counting 3DS-only titles launched after the Switch)
- 1-2 Switch!
- Snipperclips: Cut It Out, Together!
- Flip Wars
- ARMS
- Mario + Rabbids
- Fire Emblem Warriors
- Part Time UFO (started on Mobile, but came to Switch - HAL Labs rather than Nintendo)
- Nintendo LABO
- Sushi Striker: The Way of Sushido
- Dragalia Lost (mobile only)
- Cadence of Hyrule
- Astral Chain
- Ring Fit Adventure (some might argue this is a spiritual successor to Wii Fit, but I feel that being an RPG is enough of a distinguisher for this - plus the RingCon is very, very different to the Balance Board)
- The Stretchers
- Good Job!
- Jump Rope Challenge
- Buddy Mission Bond
- Game Builder Garage
- Pokémon Legends
- 3D Kirby
- Princess Peach: Showtime!
Edge Cases - aka emulation land
- Star Fox - Star Fox 2 launched for the first time during the Switch era, and eventually came to NSO
- Devil World - First ever NA release, via NSO
- Sky Skipper - First ever port, via Arcade Archives
- Kuruin - First ever NA release, via NSO
- Joy Mech Fight - First ever western release, via NSO
- Panel de Pon / Puzzle League - First ever western release of the original Panel de Pon (not the Tetris Attack version)
- A lot of franchises having NSO releases, but none being firsts in any region: Mother/Earthbound, Kid Icarus, StarTropics, NES Sports, Clu Clu Land, Excitebike, Ice Climber, Balloon Fight, Punch-Out!!, Murasame Castle, Wario's Woods, Wrecking Crew, Pilotwings, Stunt Race FX, Wario Land, Yakuman, Game & Watch, Pokémon TCG, Dr. Mario, Kaeru no Tame ni Kare wa Naru, Sin & Punishment, Custom Robo, Wave Race, 1080°, Golden Sun
As you can see, Nintendo has a ridiculous wealth of IP on Switch, which is why I don't feel that new IP necessarily
needs to be as much of a factor. Over a dozen of these franchises
(including sub-franchises) have 10m+ selling entries on Switch; a sizable chunk after that have multimillion sellers, and most of the rest are still million sellers as well. Trying to keep all of these franchises going while also having the time and manpower to create new IPs
(whether fully original or new unique sub-franchises for old IPs) is no easy task, and I think a big chunk of the talent that was going into making new IPs before is instead going towards giving Nintendo's vast back catalogue of IP a second chance at finding an audience.