I have seen a lot about the fact that Sony and Microsoft are moving more into streaming and this makes sense. A lot of people have, quite wrongly in my opinion, decided there will be no more exclusivity.
I actually think that exclusivity will still be around but in a different form. Look at the way Netflix do business. I can watch their programmes on my PS4, PC, cable platform but I do have to pay them a monthly subscription to do so.
Whilst it is clear that I will eventually be able to play a Sony exclusive on a PC through streaming I will still have to pay them a monthly fee to do so in the first place. In the same way I have to pay Netflix to watch the new season of Black Mirror, and I cannot watch the new season of Black Mirror with an Amazon Prime subscription, the same will apply to Sony exclusives. Just owning a PC will not be enough to play Naughty Dog's movie game for 2022 (or when the next consoles have finished their cycle). You will still have to pay Sony their cut.
It will free Sony/Nintendo/MS from designing and making consoles but they can still get their money. Sony/MS/Nintendo will not design a system where they can be totally removed from the revenue streams. It makes no business sense so they will not do it.