Government can do anything. Maybe they cannot make the bitcoin to go away but they can ban the use of it. But i think it unlikely because government can also profit from bitcoin. The fact that people need to convert it to fiat before you can transact has fee so yeah government can tax it and make profit from it
Well, Thats rught. Government can ban bitcoin inside their country but Any Government will not able to prevent their people to access Bitcoin. By using Virtual Private Network or also known as VPN, We can easily access other sites by using other countrys IP address. And thats what the people doing once Bitcoin banned in their country.