His theory, in reality, would only work if all major governments would cooperate (in the case the central bank in question is the FED).

Inside the "14 Eye" region it would perhaps work. But there is a major player in the Bitcoin arena which I doubt would cooperate with the US in that game: China. And while there are not many Crypto exchanges left with a "legal company seat" in mainland China, afaik some big "offshore" exchanges operate from there. I don't think it would be easy to drown these exchanges with some kind of "deal".

Ah ok, there is a way: actually _hacking_ all exchanges outside of the US . (But all hacks would have to happen roughly at the same time).