Mac OS X and OpenBSD are my daily drivers, but at their core, they are BSDs, and less and less I find myself using the NeXTSTEP portion of Mac OS X and more and more time in BSD-land, which is leading me to move more and more of my overall computer time to OpenBSD which is a great operating system but is still largely a continuation of the UNIX/POSIX/BSD model which I appreciate like fine wine but do not love.
If Fuschia ends up being the answer to the question of what would happen if we built a new operating system from scratch today, taking the best lessons we were able to learn in the past 50 years, then I might be using it as my daily driver in 10 years.
Or maybe not. Nobody can really say what it will be right now.