Yeah, there is a whole load of Steam games that will only play on Windows systems. I’m looking forward to testing the new implementation of WINE and see if it measures up. If so, I may be dumping Windows 10 for a Linux flavor. Though I don’t know if I can get the Windows XBox app to work on WINE. So that’s a consideration.
Except you can’t make Steam offer their content offline like that. By altering the language they use it effectively makes them more transparent about what you are really paying for. So, in order to use the word “buy” or “purchase” they would have to make the content available offline, or they have to use a different word that essentially means “rent” or “subscribe” cause that is what is actually happening.
That doesn’t mean that their effect on the GPU market will up and vanish overnight. Market correction doesn’t usually go down as fast as it goes up.
Edit: add to that the tariff situation and the standoff with China and Taiwan (where all the processors for gpus are made), and you have a situation where things are just going to get more expensive no matter what.