BC doesn't mean a remaster can't happen....
XONE is BC and you still got Gears remastered, Halo completely remade in a new engine, Bioshock and Borderlands got HD collections and they are still BC with XONE.
The publisher cares not if you own the original, they will still make a remake, remaster etc. Owning a PS4 and then buying a PS5 DOESN'T MEAN YOU OWN The Last Of Us 2 on PS4. They can still sell you The Last Of Us 2, remaster, GOTY edition, definitive edition etc. I don't know why folks think a publisher cares that you own the original. That is like saying you have a Bluray player combo with DVD player that upscale, thus they won't make a Titanic Bluray version, cause ohhhhh you have a player that plays both, let us not make more money, Kyle has one of those players and already owns Titanic, guess we better not seek to make more money lol The whole point was to allow you to have the option to play your older titles, not for them to NEVER remaster titles or remake titles etc. I always tell folks, in order to understand this....STOP thinking about yourself for 1 moment and think about the company's goals. It wasn't to NEVER make more money on remasters, it was to have the option to play older titles if you have them, the window to sell remasters, remakes will always be open because owning a PS4, does not mean you owned all games. I'm sure we'll even see a FFVII remake PS5 remaster at some point.
Think of it like this, PS3 was BC to PS1 native on all versions of PS3.....you still got PS1 titles ported to PSN, by that logic you should have thought "Why launch PS3 with PS1 ports, PS3 is supposed to be backwards compatible so in theory all PS1 games are already launching with it. Isn't that the whole point?"
The whole point for whom? Square? Capcom? Even Sony? The whole point was for them to NEVER remaster titles? Who told you this? If you want an idea of what will happen in the future, look to the past. BC doesn't stop remasters. Square or Capcom or Sony don't care that you own a copy of those past games, maybe they are not marketing to YOU but folks who never bought those originals.