Kinda what I, and others, did. I'm still in Windows 7 because "it was there", but I already struggle to keep it "user experience enhancement" free from Windows Update. When someone asks me for help on a W10 system, I give it a quick glance, and if it can't be fixed in two mouseclicks (most of the time it can... some people just don't get computers) I just say "I don't know anything about W10."
I slowly started to install some Ubuntu (for ease of use) on my parents' computers, and that fits most of the requirements they have: internet, flash games, video, music.
Only "niches" left for Windows are some games and stubborn business. But as time pass, the game requirement become less and less relevant, and the business thing usually work in either a VM or a pro computer dedicated to this.