The number of internet users in China is larger than the total population in the US. The trading volume in btcchina.com, however, is <2% of mtgox. Bitcoin is China is still in its infancy. Please don't kill it with the heat of anti-firewall.
Yes, the oppressive government will eventually find bitcoin as a threat to them. However, we need more Chinese people learn it before it is firewall-ed. When the government really try to wall bitcoin, Chinese people will learn to circumvent it to protect their wealth.
You do know that Gox trades in more than USD, right? There's CNY and HKD activity on there, too. Besides, these two statements cancel each other out:
Please don't kill it with the heat of anti-firewall.
Chinese people will learn to circumvent it to protect their wealth.
The more Chinese Bitcoin users have a tool to circumvent it, the faster Bitcoin will spread after the wall comes down. It's in their best interest to get that tool to as many users as possible.