I'd love to see: everything on PSN
Shin Megami Tensei IV Apocalypse sequel on PS4
Shin Megami Tensei: Nocturne remaster on PS4
SMT Digital Devil Saga/DDS 2 remaster on PS4
Persona 3 remaster on PS4
Persona 4 remaster on PS4
Strange Journey remaster/sequel on PS4
Tactics Ogre: LUCT remaster/sequel on PS4
I'd buy any and all of them day one.
No fighting game spin offs, and PLEASE no dancing game spin offs. In short, no spin offs.
I'm not sure releasing on Switch would be a good idea, there isn't going to be much of a user base for at least a couple of years, if there ever is a good sized user base, and these are fairly obscure titles and series, so I'm not sure they would sell enough to make it worth it for Atlus.
And if Atlus released SMT/Persona remasters on PC... Be honest. Most of you people would not buy them because you can just use an emulator to up rez the game. And most of those who actually would buy remasters would likely wait for a huge discount before purchasing. Releasing on PSN would likely make the most sense for Atlus.