Bitcoin is already part of the global system, but the only opponents of this head of state!
Bitcoin is being used at almost every corner of the world but still the number of people who are using bitcoin are not that much and that it will take a lot of time for bitcoin to be globally accepted and that you cannot expect this thing to happen in a day or two. It can only happen once the governments will declare these crypto currencies as legal currencies and that they will start regulating bitcoin.