[grandalf]

For highly successful companies, it's expected that they will take dominant market share within a reasonable period of time, or else they are viewed as having failed.

More importantly, Google's market share in China is symbolic of its ability to repeat its success in the US elsewhere.... this is the foundation of much of Google's current stock price.

I asked a Google finance guy what percentage of revenue comes from non-US ads and he got all red and refused to say a word. This is a HOT topic at Google and the firm can't afford to show any weakness whatsoever.