I'm just saying there's already some examples of central banks cracking down on it. From what I see, central banks usually do things in lockstep... Of course more draconian societies will be the first to do it, but I bet there'll be a crackdown on private coins in western societies eventually... Though as long as one country such as Switzerland doesn't, then there will always be value attached to private coins. Though the only problem is cashing them out. Can't buy food, pay rent, buy clothes, gas, etc, with them, what good will they be? Unless one plans on paying for those things on the black market, which, I don't know..... Buying food on the black market doesn't sound too appealing...
The other option would need drug dealers to accept crypto currencies from their dope fiend clients... Then one can give dope fiends private cryptos for their food cards, and then they use the cryptos to buy their drugs.