I have identified 5 bottlenecks that Google would have tackle otherwise Chrome OS may not make any meaningful impact on the OS market.
Reason 1 - Microsoft
Microsoft Inc. is the biggest reason why Google Chrome OS may not make any significant impact. Most of the time the strength of MS is underestimated. To give you a typical example, when Chrome the browser was launched, a lot of people touted it as the IE killer. And now two years on, Chrome the browser is still struggling to clinch to the 2% or so market share it has managed to gain. Guess which browser is still the leader. Among the reasons for the development of Chrome OS is for Google to make a direct challenge to MS. However, I doubt if MS would just stand there and watch while Google makes an incursion onto its own turf.
Reason 2 - Design
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