Government won't be able to bring all crypto currencies under their control. All they can do is force people to use it under their regulation. Even if people don't follow their regulation how is the government going to stop them? How will they keep track of those who are breaking their rules? Was the government able to remove pirating through p2p torrenting ? Nope. All they are able to do is take down those torrent site but people are still being able to connect with other users and continue pirating.
On other hand, how exactly is the government able to bring anonymous coins under supervision if they can't even know who is transacting in the first place?