I see myself potentially double dipping on, say, Persona 5.
I don't think a Switch version will be announced until a good while after April if it is announced and I'll definitely want to play it in April anyway. That said, I want Switch to be a one-stop Atlus platform for me in the future and would support a version of that game on Switch when it comes out.
With things like DQXI, at least I know already it is coming to Switch and seems likely to come at same time as other versions. I think if any version won't be localized, it'll be 3DS version, but I'm guessing that comes too.