Every country are starting to ban. What if USA ban? how will it go?
USA is always competing with japan in terms of high technology and japan right now is using cryptocurrency to improve their economy even more, most of the governments in other country does not see the good things about cryptocurrency and it was huge advantage for japan since the value of bitcoins today is continuously increasing.
Competition among countries is something that many forget, if the US banned bitcoin then other countries that allow it like Japan will win a huge advantage over countries that ban it so the only hope of the US in that scenario will be to convince japan and other similar countries to ban bitcoin as well, but as long as there are some countries were bitcoin is legal we will be able to continue to do business as usual.