Windows 10 will have been around for 10 years at that point. That’s a pretty good run. You know another OS that is stopping support after 10 years? Ubuntu 14 LTS, but no one complains about that. People freaked out when Windows 7 went EOL, and XP before that.
I just find it fucking hilarious that people expect software to be supported in excess of 10 years, paid or not, when that’s never really been the case over the past 40 years of software. Sure someone will probably come up with an edge case somewhere, but if you developed software, and continually released versions and updates, would you want to maintain a version you released that long ago?