Steam Deck can only run a subset of games available to Windows. Many online games still rely on Windows to interface with their custom anti-cheat kernel drivers so Steam OS still isn't a true replacement to Windows ...Steam Deck runs games without Windows, so we are we expecting that ten years from now cloud platforms will be locked into Windows VMs? If Valve actually released a desktop version of the Steam Deck OS, what might happen? They pretty much have a monopoly on the PC storefront.
My main point is basically that you can't predict the tech market, or pretty much anything ten years out. You just can't. Anyone that says they can is full of shit. Everyone thought Microsoft was going to have a browser monopoly and they did for a time ... until they didn't. Google just took it from them.
You honestly somehow think that game developers will move away from Windows ? Because regulators don't seem convinced otherwise ...