Bitcoin can't really be banned. It's on the internet. If people really want to use it they can. Is the government going to ban Bitcoin mining?
Sure, they can ban mining within their country. For example, Venezuela has banned imports of all mining equipment into the country a few months ago. But as long as Bitcoins are being mined somewhere the people can keep exchanging Bitcoins.
If a government bans Bitcoins in that country, most people wouldn't use it, as they would want to be law abiding citizens. But some people would still continue to use it.