me too. 90% of what I need to do at home I can achieve on Linux, and the other 10% I just do on my work PC. And I'm learning Linux scripting which is expanding my computational abilities. I should have made this switch a decade ago.
This is the problem the PC market is truly wrestling with. The processor capabilities and memory needs of modern personal computing has basically maxed itself out. Any and all upgrades to data processing are fairly minute and therefore older PCs are remaining completely acceptable for far longer than they were just 15 years ago.
I don't think most people would be throwing their PCs out at all. Computers are a big expensive purchase, and people don't know that they shouldn't be running an out-of-date system. So neither Linux nor Windows 11 is happening, people would just happily go on with Windows 10 unless MS outright bricks their devices. Same for small companies. I would only be concerned about this for large corporations.