I think Holiday 2019 is very plausible, 7nm Zen+/Navi will have been optimizing yield for more than year by then.
They can still in parallel sell low price point Slimmed Pro with x-gen compatability ala Scorpio/Bone or PS4/3,
so a higher than optimal price needn't overly tank unit sales, hardcore early adopters will be ready for new gen.
I don't see later than Holiday 2020.
Likewise interesting to see what MS will do, will they match PS5 intro date or wait a year+ and target higher $/spec?







