I think if we talk about new original game release, I can see FY2024/25 will final Switch year of original new games (comercially speaking...) like Donkey Kong, Metroid Prime 4, 2D Zelda, Pokémon RPG, Tomadachi, etc
Then surely that Nintendo will continue releasing Gamecube/Wii/3DS remasters/remakes through this FY to foward. Titles like LM1, Mario Sunshine, F-Zero GX, Paper Mario TTYD, Kirby Air Ride, Metroid Prime 2/3, Zelda WW/TP, Mario Galaxy 1/2, DKC Returns, NSMBWii, Kirby Epic Yarn, Punch Out, Kid Icarus Uprising, Zelda ALBW, Mario 3D Land, Metroid Samus Returns. They can dropped like 3-5 those titles each FY.
And then full ground from zero remakes like Super Mario RPG or rumoured FE4 can possible be cross-gen for this to next FY.
But as I said, I think FY2024/25 will be the last one with mayor new original releases, then FY2025/26 and foward Switch 1 will only receive remasters/remakes from NGC, Wii and/or 3DS.
(I'm repeating myself, I know, but I think it's an important point).
Nintendo is a forward-looking company. They know major titles take 5-6 years to develop, significant titles take 3-4 years, AA titles take 2-3 years and ports/remasters take 1-2 years.
They've been releasing a dozen games every year. Some years are better than others, but they always have something significant to release.
They already have a dozen games in development that is releasing next year, another dozen or so that is releasing in 2025, and a bunch that are releasing later. They will develop or commission ports and AA cash-grabs as needed to fill each yearly calendar. They are even known to hold onto finished games waiting for a convenient spot.
And they know that major titles, (BotW, TotK, Mario Kart, Odyssey, Smash, some ports, etc) are the only ones able to move a significant number of hardware. They have those sparsely scheduled and were commissioned a long time ago.
They probably have 30+ games is development right now!
A couple of those may even be targeting a Switch 3 at this point.
With Nintendo's output, it doesn't really matter when a new generation is releasing in terms of software.
They may shift a few titles around, maybe wait a couple of months, but it will always be very appealing and the following months or years will also be very appealing.
They won't launch the Switch 2 with 50 exclusives. There will be one, only one, and a minor title such 2-3 Switch with a donkey guy, maybe third-party ports.
Then release another exclusive 3-6 months later to reinvigorate demand and maximize each game's sales.
And so on.
Nintendo may still be overly relying on ports and cash-grabs, but they're playing chess and looking forward a decade..