This is so re ed... so they get to shutdown the DNS entry (which opens a huge can of worms, because while the majority of root servers are in the US, there's nothing precluding other countries to run their own, which they obviously will if forced to), but they really are not affecting the sites. All the site ops need to do is have a couple of backup dyndns-type of hostnames until they get a different domain name.
Who proposes this ? It's actually going to hurt more than help.