The government obviously cannot be able to control bitcoin itself, but they're going to control the bitcoin exchanges.

Seeing that bitcoin is still in its early stages and there are a lot of centralized exchanges around generating massive volume on a daily basis, to control the regulations surrounding bitcoin exchanges is basically controlling half of what bitcoin is.

However, it is impossible to ban bitcoin altogether, if governments are looknig to do that because the system is decentralized, and they can't just shut down one single server to get rid of bitcoin. Even if they shut down all the exchanges, the trading will just go p2p instead of on centralized platforms.