Maybe true, but interestingly, Linux is about 10% of laptop market share (7.5% ChromeOS/ChromiumOS, 2.5% Linux), already fairly successful. (And ChromeOS can and does run Linux applications now.)
I don't consider ChromiumOS to be GNU/Linux. The kernel itself doesn't count -- obviously the kernel has little to do with the user experience. Android is much different than the experience of an X11/Gnome or KDE desktop. The graphics stack is entirely different.