Can MS & Sony just simply make next gen fully BC?

[forevercloud3000]

Correct me if I am wrong but Emulation is how you can be BC and not require Developer permissions.

Basically if the PS5 can emulate a PS4 via Software or partially Hardware wise it will be a piece of cake. It is largely considered that PS5 upgrade will be linear from PS4, meaning it shouldn't be difficult to do. PS3 started out with full BC because it used actual PS2 hardware inside to emulate. The later models lost that part of the chip to cut costs....but the PS1 games are actually still software emulated on all PS3s.

MS method of emulation can largely be the same as it is on XB1. Could actually be surprised if the huge power increase allows for more direct 360 emulation seeing as it isn't the drastically different like the PS3 was to PS4.