it is impossible. BTC is annonymous, which mean those ppl who can use it to buy drug, weapon or others without notice anyone. do you think gov will allow this happen in later future?
BTC are not annonymous as people think. If you pay with Bitcoins or regular money, if you want to do something secretly, you can always find a way to do that. But for the benefit of the Bitcoins, is it better that more countries accept it as a legal payment.