My current plan is to keep going with Windows 10 for at least another year (maybe two), while it's still mainstream. Then probably switch to FreeBSD with an ancient window manager, so I can use UI paradigms that are stable. But, I mostly am in the browser, and use one of the Apache Libre OpenOffice.org suites for documents. Maybe some light gaming which will be a challenge on FreeBSD, but then I'm a classic PC gamer, getting the game to run is the fun part, you don't actually need to play it.