To be honest the the efforts that MS put into BC of X1 is very commendable and praise worthy and the results are outstanding. Some games had double the performance boost and 4K resolution upgrades. Of course X1 is still shit and pointless but the concept has been proven and it works.
Now similarly to MS situation, I would expect the PS5 to run PS4 games with a significant upgrades in terms of resolution and a semi flawless 30 fps if not higher than 30 fps.
I would be very disappointed if PS5 can just run PS4 games
What do you think SW?