Interesting take. I would be interested in reading more about these game devs dropping native linux support. Could you provide some examples?
If we are honnest with ourselves, we know that many games devs which did provide native elf/linux builds and which are not announcing elf/linux support anymore for their future games, it is because of proton.
And at the same time, you have some "games" currently being developed which are running state-of-the-art UE5 engine (for instance "vein") with a native elf/linux build. And we are talking super small teams.