In my opinion, bitcoin is very potential to be a global currency, but not shifting the existence of other global currencies. In principle, bitcoin as a global currency that equips with other global currencies. bitcoin does not replace other global currencies. But indeed to reach this point is very difficult and it takes a very difficult business struggle. Now a lot of bitcoin makers are trying to drop the bitcoin. Therefore, as a wise crypto currency player, we should campaign for bitcoin's positive side so bitcoin could soon reach the point as a global currency.