A value-add that would actually get me to get a PS5 Pro would be to offer more backwards compatibility, at least PS1-PS2 with increased pixel resolution or some other upscaling method. I know they offer cloud streaming versions of older games, but the latency sucks.
The disc laser in my old fatty ps3 stopped working, and I'd like to play my older game library on the new device that doesn't sound like a jet engine when it boots.
Since it will likely have a detachable disc drive option, would be cool if it could read older games, even though everything I'm asking is incredible unlikely.