Yes. 2024 is currently expected as the last calendar year before Switch is replaced and look at everything, we've received this year.
2025 does have some stuff already for Switch, granted. Off the top of my head, there's Metroid Prime 4 and Pokemon Legends Z-A. I doubt any other big titles from Nintendo for Switch are unannounced unless they're crossgen.
I would expect more remasters and a small title or two.
And obviously there is still a mountain of unannounced third-party titles.

If Switch 2 integrates Switch 1 like most devices do, rather than simple backwards compatibility, then there will be plenty. All lower fidelity and low end versions of games will be available on Switch 1.

If it’s more of a hacky type Wii-Mode, or GBA slot, that sort of thing. Much less likely.

Yeah, from Nintendo at least. This isn't like the situation with WiiU where the last few games were low effort and then they left that system behind.
I imagine they'll release cross generational games for a while for both Switch 1 and Switch 2.

There surely is, just look at how long they supported the 3DS. If that got Nintendo games till early 2019 then the Switch should get stuff for at least a couple years after the Switch 2 launches even if it's mainly small stuff that's cross-gen.

In terms of first party, there maybe still be some small unannounced games even coming out after the successor launches. I wouldn't expect any more major first party games on Switch though.

Since this post was made:

Likely there are plenty more to come.