People aren't homogeneous. This won't be enough to make Linux a better option for the majority of people, but it does mitigate a really severe pain point. I've kept my desktop a Windows machine for years because of gaming, but use Linux on my laptop. Now, it looks like the two crucial publishers for me (Valve and Paradox) are going to support Linux, and honestly that's good enough given I sort of wanted to switch anyways. I'll probably keep my other partition around, but I expect I'll be doing most of my gaming on Linux once this is ready.

And the more people who switch to gaming on Linux for reasons like mine, the more companies will tend to support it.