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.
Regulation will be soon implemented in many country which has temporarily banned trading. But I don't think they will be accepting it as legal tender, though private firms can accept it as payment and they will do it. If this happens only Bitcoin will not be the one which will be the highly used currency as of now.
Some big private firms have already started bitcoin as payment method. I have heard that now even google is thinking about and very soon they are going to start bitcoin as for payment method. I think that it will really give more support to bitcoin.