Someday sooner or later, If the chinese goverment blocked the Internet access to the whole world,
What can we do?
Do we have any availible plan to protect the great-BTC-chain?
You forgot about one thing. What would be the point of the Chinese or any other government banning bitcoin? If ones country banned bitcoin, it would cause a significant amount of impact to the market of the country and also the price of bitcoin. If a country banned bitcoin, heaps of bitcoin will be lost and therefor supply would have decreased, which will mean a surge in market price.
China has the lowest electricity costs and is most profitable for mining, now why would the Chinese government ban bitcoin? They might as well tax it and make some money off of it.