Actually it is not that easy to ban.

The Bitcoin code is open source. Anyone from anywhere can download the code and run a local copy. Your coins are securely stored across computers all over the world. Your balance cannot be frozen by any authority. Maybe central exchanges that convert fiat to Bitcoin could be regulated, but mining cannot be stopped, transactions cannot be stopped. Unless governments all over the world shut down electricity and internet.

At that point question mark is on the government that does this rather than Bitcoin.