That's irrelevant for two reasons: it's not simply a matter of ssd speed (which will be matched by new ones within not much time after ps5 launch). It's a matter of architecture in general. You can have an ssd potentially four times faster than the one ps5 will have (and in some years from now they will), but without dedicated processors and architecture built around it, it will still be far below the performance in ps5 (as it is now when you put an ssd in a console; you just have a little advantage in loading times).
The second reason is that the games that have to run on pc will be developed around the lowest common denominator (normal hdd), to ensure compatibility (it's not a "graphic scalability" kind of thing: it's about the very structure of a game, of gameplay. So you will not see for years games on pc with a gameplay built around ssd capabilities.
Unfortunately, that means that the only games that will really use ssd completely (beyond loading times) will only be excusives.
But a first step has to be done, and it's alredy a dream came true, for me. I was waiting ssd implementation since last gen.