To ban bitcoin in the world is to shutdown internet in the whole world which will affect all the sectors in government which the government can't function as well. The world economy will stop and no business can move in whole world, even transportation will be stopped. And the government can't do it because they will trillions of dollars in it, and private businessmen will not allow such to happen. What I am trying to is that governments in the world can not stopped the uses of bitcoin because bitcoin is decentralized system. Country's governments can only ban bitcoin from transactions through Fiat banks and not or they can't stop the p2p transaction process.