Do you really think that the government doesn't know about other DNS servers?
Yes, after some TV magazine report, I know that they don't think that far. Blocking people from getting there is not the point. Intimidation, and getting the people used to this kind of government, is the real point.
I can reinforce that. The music industry is already calling on the government to include filesharing and torrent networks.
So you can see where they're heading...