Yup, that'd also be the case for people like me who stick with Windows for gaming compatibility/convenience reasons and critical GPU features the Linux drivers just don't implement (looking at you, DLDSR). That, or just anyone with a GPU, I suppose, assuming the hardware market would look remotely like it does nowadays by then.

Will this actually be the straw that breaks the camel’s back, or will everyone just continue to say “but I can only do this on a PC” and not even attempt to look at Linux or MacOS as an alternative.

My moneys on the latter. People have been complaining about anti-consumer practices from Microsoft since Windows 7, but it always ends the same way. Microsoft has most of the world by the balls and they know they can squeeze tighter and tighter and not lose 99% of their customers.