They could definitely kill it. In most cases, I don't believe it would be in the form of "outlawing" crypto, or anything that overtly dramatic, instead it would be something like banning/closing exchanges, or banning banks from receiving fiat from exchanges. They might do this kind of thing to prevent capital flight during a crisis, if that capital flight took the form of people bailing in mass on their countries' currency (think Venezuela if the people had more agency). Regardless of why they did it, this would effectively collapse the price, especially if enough major governments did so.
they cant outlaw crypto because what they are then going to build is basically banks run by regional gays, (gay germans in deutsche bank) gay new yorkers in moodies
gay chinese in bank of china etc. opening large scale abuse for those respective social prisons, gay jews in israel....
thats the problem with regional statism in general its the gays in the financial system. they force all migrants to sell their time thats why there is conflict with them
they then are seeking to define regional rules, like some bridge trolls to decrease freedom for others.
thats why cryptos will continue to run it gives opportuntity to gain capitalism if you dont feel yourselves identifiing with the communist banksters, the technology that is used, gives freedom to operate globally, independent from the communist.
i its likely that these communists will end up as local gangsters trying to imprison all at the expense of others in their "financial" cartels.
thats everything they have to protect the value of their currencies. and thats the threat comming from them, that and constant insults on others, who dont fit into their agenda.