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it's my sincerest bet that if there will be DPPt remakes, they will be on the 3DS, maybe a dual release on the switch, but it will be the last urah for pokemon on the 3DS, before the inevitable switch to the switch, which is essentially confirmed by GF themselves.
remember BW2 released while the DS was dying and the 3ds was already on the market. It's not atypical for GF to stagger their releases on the 'new' console until it's out and the userbase is established, and they've had the time to work with the new programming environment.
GF is a slow and steady player. never on the bleeding edge.