2012 didn't see any single large Linux news story. Instead, we saw many small Linux stories that, when added together, led to Linux becoming the single most important operating system of all. Here's the count-down to the top of the operating system stack.
5) Raspberry Pi is as popular as apple pie
People love their polished hardware devices such as the Apple iPad, but some still love do-it-yourself *DIY) gear and nothing says DIY quite so much as the Raspberry Pi. This Linux-powered credit-card sized computer is as bare-bones as it comes, but it still had over 250,000 people on its buyers waiting list before its launch. Months later it's still insanely popular.
Google's goal is to give users a cheaper Linux-based solution to Windows and Office. Getting users off legacy Windows systems wont' be easy. On the other hand, Windows 8 requires users to learn a new way to do the same old things, and Google's offerings let them keep using the good old Windows, Icon, Menu, and Pointer (WIMP) interface. I foresee users shifting away from desktop Windows to Chromebook and from Microsoft Office to Google Docs as they retire their Windows XP and 7 PCs.
On top of all these other changes, add in the simple fact that the old PC is no longer the heart of computing and what you end up with is a world where the most popular end-user computing devices aren't running Windows, instead they're running Android.