There already is a black market in for Bitcoin in the United States, that's basically all Bitcoin is used for these days aside from speculation. The fact that i

There already is a black market in for Bitcoin in the United States, that's basically all Bitcoin is used for these days aside from speculation. The fact that it would become a black market for Bitcoin itself doesn't change much. Almost all Bitcoin purchases these days are done through exchanges and held on exchanges, managing Bitcoin wallets is enough of a technical challenge that it will never be in any way widespread without the support of exchanges.