Do they really "teach Windows" in schools? I see way more people treat the browser as the OS, if they even use a non-mobile device.

Your comment is full of phrases that answer why consumers and enterprise won't switch: "pretty stable", "good enough", "a pretty good option". This are true for the Windows default; why switch?

Sadly, schools don't have real computers any more, it's all chromebooks. Gen Alpha is going to be completely computer illiterate.

Windows would be 'taught' as a byproduct of another activity involving Windows software, usually starting with Office/365.