Seriously, am I the only one who doesn't want any more remakes? As much as I would love to revisit older regions, I'd rather do it in a B2/W2-esque sequel.
One more thing about DLC regions and why I don't think they're happening: I just remembered a picture I've seen on Pokémemes destroying the idea for a Pokémon game with all regions. I don't exactly remember if it was its only point or just one of the many, but here it is: in GSC, you have Kanto, where the Gym leaders are stronger than the Pokémon league. Imagine if you had a third and a fourth region after this, each region having even stronger opponents? I'm not sure the games have a level cap high enough to accommodate all this while keeping it consistently challenging.
Isn't it supposed not to physically exist anymore? I mean, correct me if I'm wrong, but I thought Reshiram and Zekrom were two halves of the dragon's spirit, and Kyurem was what's left of its body.