For the pros too it's not about the hardware or graphics, many use the lowest possible settings to make sure they get a decent performance. I don't know if it's still a thing but in Counter Strike people use very low resolutions to enhance performance, have better vision and reduce mouse movement. We are talking about games where a few ms can make a difference.
What is selling hardware is not eSports. It's all those games that look amazing and perform the best on great hardware. Skyrim(or even GTA V) for example, on a console will never look as good as on a PC. A recent controversy was that on PC Watchdogs was "downgraded" before release to look more like the console version because they weren't powerful enough.
Here's another thing that is saving the PC industry, the mod community.
If there is one thing for sure is that phone gaming wont destroy PC gaming.