The heavy lifting with porting from PS3 to more PC-like PS4 was already done, and adding a better texture pack is fan-mod work of bored capable fans, recently AIs probably can do it, which would improve the visuals already tremendously, and on top of that maybe they could add raytracing and that would be imho better than releasing successors which kind of require to have played predecessors. It at least makes a lot more sense to play them in release order.
The games imho still look nice, any old but then AAA-game with a 1080p resolution looks good, not jaw on the floor, but nice enough. All three of them. Almost all PS360 games look good enough for remasters. Even some emulated PS2 or even N64 games can look good enough. As long as the result is not like Silent Hill HD collection where the remaster killed the atmosphere or GTA Collection where they replaced much stuff, but insanely sloppy, then imho most people would accept them for what they are. If there are plans to remake them properly that should have happened before doing the successors, otherwise just release a quick port with some work on top.