If Valve went for the corporate market, then, maybe, yes, but I think MSFT has always made most of its OS money on corporate stuff (home users often use Windows, because that's what they work with).
Gaming isn't really a thing, with corporate use.
I use a Mac. Macs are some of the worst gaming platforms on Earth. If I'm lucky enough to get an AAA game, it's seven years behind its PC version, and a huge bug farm.
SteamOS might actually get me to consider a console, but gaming hasn't ever really been a priority for me (obv.).
You're right in the short term, but in the long term (decade+), the home and corporate markets are symbiotic. People buy for the office the tools they expect employees to be comfortable and familiar with. It's not the only factor in consideration, but it's a significant one. Any meaningful erosion in employees' understanding of how to use Windows, in the long term (definitely not the short term), poses a threat.
Microsoft has a very long time to respond, tho, and that assumes Valve even prioritizes a general use OS. This problem is not urgent, if it is real at all.
Gaming isn't really a thing, with corporate use.
I use a Mac. Macs are some of the worst gaming platforms on Earth. If I'm lucky enough to get an AAA game, it's seven years behind its PC version, and a huge bug farm.
SteamOS might actually get me to consider a console, but gaming hasn't ever really been a priority for me (obv.).