Whelp, that's the end of cryptocurrency... probably should sell your HODLings now. If we're going to Patriot Act the crud out of ransomware, Bitcoin is gonna be illegal.
Yeah, that's what happened with drugs. The price of drugs actually dropped to zero and it's now impossible to get LSD.
Drugs are renowned as a special case when it comes to states' enforcement power. Currency control is not.
Outside failed states, capital controls and foreign currency restrictions have been historically well enforced and followed.
The U.S. banning cryptocurrencies, sanctioning connected individuals and firms and committing to leveling repeated 51% attacks would functionally destroy most cryptocurrencies. (There is zero indication this is being contemplated.)