Buy the drive that works best for you right now, not contingent on a future yet to be seen.

Q: With the new consoles rewriting how hardware will be utilized, is having the higher bandwidth of PCI 4 going to be an important factor in future games?

The specs for the upcoming PlayStation 5 and Xbox Series X include serious hardware—enough to make some DIY PC builders wonder if they’ll need the higher bandwidth of PCIe 4.0 to keep up with future games. The rationale: Game developers will treat the new consoles’ blazing-fast storage drives as the baseline.
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https://www.pcworld.com/article/3573076/do-you-need-a-pcie-4-ssd-for-gaming-ask-an-expert.html