Usability (Score 1)

There is no incentive for the majority of end-users to use Linux. Few people bother with desktops to start with and the ones that do usually buy a pre-built which comes with windows installed. Windows is prettier, already installed, and has significantly fewer driver issues. Linux wins in smartphones and servers but end-users don't care about a slight boost in efficiency at the cost of aesthetics and installation hassle and will continue to use Windows.