I agree with B/C for PS1. There's little excuse not to have an emulator on the PS4. It would also lead to more sales on PSN. I do like the PS2 ports on PS4. Look much better. I just wish they would release them more regularly. PS3 is probably impossible, considering the architecture. Though, the PS5 should be powerful enough to pull it off, so I do hope they make the PS5 B/C with all PS4 systems.