Linux has found its niche on the server side and among tech enthusiasts and counter-culture types, and that’s okay! I, for one, like it that way. Having Linux at home is a nice change from using Windows at work all day, but I might not feel the same way if I used Linux at work.
I don’t consider myself a Linux fanatic by any means, but I do think that something like Linux Mint is viable for pretty much anyone as their home desktop OS, in the much the same way that Android is viable for anyone as their mobile OS. As others have said, the main thing where Linux needs to improve for home users is game support, and that has already come a long, long way. If all my games worked perfectly on Linux, I would ditch Windows at home altogether. Fortunately, Steam is pushing for more Linux support.