Once proton works on everything, the companies that make the software than bans you will fix their stuff to work in those confines as well. Valve makes the biggest, VAC (edit: I was told EAC was bigger below, but that it supports Linux), and they also make proton, and they own steam, so they’ll be able to force other companies to submit in any case. I’m more worried about peripherals myself, since there are some gaming peripherals that were made with windows in mind only. AAA game developers only have the power if people choose to load their launchers (EA's for example) but most people I know avoid those and use Steam or Epic stores or GOG or whatever for non AAA games.

Edit: I am "posting too fast" it seems (a few messages per hour, I guess?), so here's a response to a comment below here about the mixed-OS household:

I wouldn't mind using macOS or Linux, and I actually would pay if I could install macOS on my PC tower. I might be the idiot here, jumping out of the MS frying pan into the Apple fire, but I find macOS to be just fine for my use, and not too locked down overall when it comes to running the software I need on it and it's very well integrated with some of my other tech stuff. Sure, I can't tweak every aspect of the OS, but I don't mind how it works out of the box so I am cool with that. It would also be nice if I could use some of the macOS features on other platforms, like iCloud, Messages (whatever the blue-bubble messages are called), and iPhone integrations.