I find this news of Chromebook stealing Windows market share has a "they have this coming to them" feeling. So Google has the bucks and the talent to make an OS and practically give it away. Ha Ha. For them, pushing the penetration of Internet use to the lowest strata is all they need because its the clicks, not the OS licenses that make their revenue.
I feel like its karma, like the demise of MS is deserved because, in spite of Bill Gates earlier public dismissal of the Internet as fad, MS came back with a brutal, loss-leader give-away of IE just to defend itself from its own hubris [and inadvertently polluting their own OS with "back orifices"]. Google may cut the legs from under MS but primarily because they know where their bread is buttered and they work to expand that...not because they need to damage the business model of a competitor.
Microsoft has it coming.