(I'm happy to see that I'm recognised for my love for this franchise
)
Honestly I think it will take me time to adjust to the lack of the dual screen, but I think that they can make it work if they do a full remake (with a remaster it will be harder imho, because it would be obvious that it was meant to be on two screens...). For the street pass feature I think they can change it with only spot pass (i.e. online) and that's it.
I'm more worried about the lack of the camera tho, since it's used in some occasions in the game. But again, I think they can make it work with a full remake.
Another thing I'm worried about is the reconstruction minigame + the sleep points. In the 3DS you could put your console in sleep mode and that's it, but I think it's trickier on the switch.
You can always put that in sleep mode too, but not everyone has a personal switch but more of a common switch for all the family. In that case I think it will be harder to use the sleep mode to obtain new shops and the sleep points.
(Also, please, no microtransation again for the sleep points. That option should be completely abolished lmao.)
I loved BDII! I think the story is not as good as BD, but honestly I loved everything else about that game, so I highly recommend it!