Yes you are right. There is no other way to stop bitcoin because even if the government dont legalize it people will still use it.
I agree, the government will never get their hands on the BTC whatever they'll do since its decentralized.
It can only happen in a way when all the power stuff will be down and this can only happen in a situation of third world war. Where the infra-structure will be damaged as a whole.
Yeah, talk about post apocalyptic setting.