Now we can see some countries are regulating bitcoin and some government don't like it.Otherwise Bitcoin hasn't a stable price.
So my question is can bitcoin be a main currency of world economy?
In my own opinion, bitcoins can be the main currency of a country only if those government are going to legalize cryptocurrency in their country since most of the people today wants faster transactions.
Many countries are in consideration and are very close to adopt the system of Bitcoin in their countries and these are those countries who were against it but now they have realized its importance by observing the progress of other countries with the Bitcoin. It contributes more to the economic growth of a country and we know that we search for benefit so all the other countries will realize as well about it.