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?
I think, depending on the leader in a country, they have reasons why other country banned bitcoin. Especially governments are not able to tract payments in bitcoin because it become very much difficult for governments to audit transactions and perform their obligations. And the other reasons is to prevent tax frauds and funding illegal activities.