I think that Epic Killing Linux native is a shame but I also think that Valve has a long plan to make it a viable platform, and it's only begun, where many assumed they hit and missed.
The fact their VR headset will run on Linux too...
It looks like this won't matter too much to future of Linux gaming is all I'm saying.
If money and users are there, it's a different ballgame.
Though certainly they've been doing a lot of work behind the scenes with Proton now. I'm not sure where Proton leads quite yet other than making their existing Linux user base very happy. It's certainly increased the stickiness for me.