While Google is trying with their best efforts to fully develop Chrome OS, I think that Microsoft's OS definitely takes over in some aspects. Chrome OS might be good for notebooks, but I doubt they'll take over the desktop OS.
We've had that in the US for decades. It's called Unix. Nothing new with any of that. ChromeOS is a variant of the same thing. A few weeks ago I said this: 1 out of every 3 of you will be using ChromeOS to some extent in 3 years. Guaranteed.