Some of you are missing my point, or I didn't explain it well. IPv6 will make it MUCH easier to firewall based on location. Yes, I know you can get geographical info of current IPv4 addresses now, but I'm saying with v6, it will be easier.
It might be easier with IPv6, but it is easy enough now with IPv4. If a government wants to restrict Internet by country of IP address, they will do it. In fact, the decision to do so would probably be made by people who neither know nor care exactly how the filtering works on a technical level.