DP Remakes exclusive to 3DS would make no sense to me and here is why:
- You can still play the originals on the 3DS
- The 3DS isn't that much more powerful than the DS
- The 3DS is nearing its end of life
- Sun and Moon set up many elements for a sequel, or at the very least a third version; throwing in a remake in gen 7, who only really has time for just another set of games in my opinion, would leave too many things up in the air
- Many people criticized DP (and to a lesser extent Platinum) because of their performance issues and slowness. Considering SM's own performance, they would be plagued in the same way and perhaps even more, resulting in a failed remake (whose general purpose is to take an old game and put it to current standards)
- Obviously patterns can be broken, but so far no console has had more than one remake
- Eurogamer's leak explicitly said Stars is a Switch exclusive, meaning, if true, that going back to 3DS exclusivity afterwards (like some have speculated) is just not going to happen
Of course, I might be wrong, but I wanted to spend a few minutes trying to explain why I don't think DP remakes are happening now. I'd be disappointed if it ended that way.