This is the long term wish for many people from long. But Bitcoin should struggling a lot to shine in the market. World currency is not a easy one.It should be accept by the All the country as like a dollar. All the bitcoin investors will get happy for this.
Everyone accept that bitcoin is the world currency, but the problem is that still it is not available everywhere, bitcoin can only facilitate people in modern coutnries where bitcoin is more common and is conside by their government as legal currency, i think that with the passage of time bitcoin will become more popular throughout the world and then it will facilitate all the people of the worlld equally.