Yes this is what distinguishes bitcoin with real money, there are currently hundreds of currency (every country have a currency), so as to make a clear distinction, the world would be better if one currency and I think bitcoin can be use.
Bitcoin will never be the only worldwide currency, no matter what will happen. Also what you are describing is the pure ideology of the Elite and Bitcoin is one of the reason it has been created, to fight this same Elite people. To avoid the monopole of our freedom, in case of bitcon, our financial freedom. We are so much restricted with the current banking system, for exemple take a look at your visa card, you are limited weekly with a defined ammount of money that you can use with it. Why? It's your money. With the current banking system we are limited over the control of our money, often in the name of the war against illegal money. Bitcoin removes this limits, and gives you a full control of your funds. With Bitcoin, you're your own bank, you set your own limits.