All forms of censorship is wrong and against free will. You born into a world and you should be able to interact with it as you wish without fear of some "law" man arresting you because his opinion is different and throwing you into a cage somehow solves this issue?
Such a law would be passed off as an anti-terrorism measure because that's what's used to kill freedoms and systems outside the conventional institutions. Everyone laps it up too, that's the worst part.
Fortunately, enough billionaires are involved in cryptocurrencies to fight fiercely over any attempts to ban it. Also, the American government itself has an incentive to keep bitcoin alive - for clandestine operations requiring funding from outside of Congress. Also, any politicians who attempt to stifle blockchain innovation could be accused of attacking the economy itself. It is highly doubtful such a bill would gain traction.
The day the first person is arrested for bitcoin is the day the people will take up arms. The moment the government starts just arresting people that's when people start getting pissed off. Here Cannabis was banned and is now legal. The law was only there to give the law and excuse to harrass people. It causes more damage then it solves.