I use Linux every single day.. My laptop has Ubuntu 12.04 on it.. Desktop has 13.04.. I've used Linux off and on(mostly on) since 2007 or so.. Linux had it's chance to make noise when MS came out with Vista, Vista was a failure and unpopular the 1st day it was released.. But Linux/Ubuntu never made an inroad, mostly because of what was mentioned here earlier, hardware driver problems.
Too many headaches, too many problems, too much confusion with hardware drivers.. There's no way the general public will ever embraced an OS that they have to constantly 'tweak'.. It's better now.. 12.04 and 13.04 give me no problems.. But now? It's too late.
I also have a Chromebook.. Very lite, very fast, it's a slimmed down OS. Most gaming is done on-line.. .Actually it's probably Linux, or based on Linux.. The smaller, less top heavy OS's are probably the future.