There's massive value and there's a reason Sony haven't done this simple remaster. They'd rather cash in on a remake. It would do big numbers on both ps5 and pc especially.I mean all Bloodborne needs is a port running 4K60. Not sure if there is value is remaking the game.
As for Dreams being on nintendo and mobile, it should be on whatever can run it. I'm sure Sony is looking at everything for it.