This is something which I've beleived for awhile, which is the prospect that if big governments and banks worked heavily together they'd be able to remove Bitcoin from the face of the earth. They wouldn't ban it, as that would be a tough thing to swallow for the American people as they wouldn't see a good reason to do that ( at least in my mind here) But they could just go ahead and regulate Bitcoin into oblivion, making it hard for Bitcoin businesses (buying and selling, trading, etc) to operate within their countries, or be subject to insane taxes, KYC AML and such.
Do you think Governments could kill Bitcoin?
Well in my opinion, they could not stop the bitcoin. Even though we know what is the capabilities of governmnet still it will be tough for them to stop it. And even now they can't still found out who is this satoshi nakamoto who is the creator of bitcoin. They can compete with it by just making of their own bitcoin but they cannot replace it.