I mean it's plausible. Nintendo is too unpredictable, so it's very hard to say for sure what is coming next.
I personally am still expecting something 3D Mario related, it's been over 5 years since Odyssey. Otherwise, I don't know if there are many other big first party games coming soonish.
I doubt we'll get a new game in these series:
- Zelda
- Xenoblade
- Fire Emblem
- Mario Kart (DLC is still ongoing and MK8 is for eternity)
- Smash
- Splatoon
- Mario Party
- Luigi's Mansion (I don't think Next Level will have anything coming soon. Mario Strikers released soon after LM3, but that didn't have much content)
- Mario Sports (I should say anything from Camelot, though I think they are likely a few years into developing their next game, just not something coming in the next 12-18 months)
I still believe Fire Emblem Genealogy of the Holy War remake is still on the table. There is also still Pikmin, but that's not really a big IP.
There is always a new Pokémon game coming out, but for 2023 I think (and really hope) all they'll do is DLC for SV.
And the further along we go without a hint of Metroid Prime 4, the more I believe they'll just have it be a cross-gen game. I don't know why, but I'd be surprised if it comes out by the end of 2023.
I also don't get why people get so offended and almost hostile whenever anyone says they doubt we'll get many big releases soon. This time last year lots of people were so sure this year would be 2017 part 2, but it's not. Neither will be 2023.
Lots of stuff got delayed or shuffled around. Apparently even a new Switch hardware. Again, everything is possible, nothing is likely.