I'll have to see it to believe but Sony was objectively right with
Checkerboard rendering last generation, it became the defacto way to play
games going forward from there on we got all kinds of techniques for improving IQ.
Unless PSSR is transformative, I don't see why you'd pay an additional $300 for marginally
better IQ.
PS4Pro had substantially better IQ than PS4 would ever hope to offer on top of often providing better framerates.
I'll wait until launch but if it isn't a big enough difference, I'd just roll that $800 into the ps6 instead of the pro.