Depends on what components you get. People who purchase the most powerful setup right now will probably be able to run a lot of PS6 games.
If you get a decent setup, you may even skip upgrades. I have a RTX 3050 (I paid R$ 1.150 BRL for it) but I knew what I was purchasing. I can run some PS5 games with pretty nice quality, but when the PS6 come out I'll probably only play indies and low demanding games.
Remember that not all next-gen games requires a very powerful RIG. Silent Hill f never came for PS4, but it runs really well on modest PCs.








