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?
I think why many countries are accepting bitcoin is because the country itself have the knowledge how to control the their people but some government did not accept it because they afraid that the bitcoin may replace the currency of their country. I think if the bitcoin become the main currency of the world economy, the bitcoin is already stable and ready to be the main currency of the world.