Of course, Bitcoin can be a world currency. However, Bitcoin is not valid in all countries. But seeing the popularity of Bitcoin,it will be the world currency for a time.Only the bitcoin has been known in all the countries, which could not make any other coins.Everywhere they are Bitcoin,world Currency Will be.
I agree with this we cant say that it will be possibly be a currency if there would be so much countries who banned Bitcoin as there medoum of payment of either the accessibility of a country to Bitcoin is now prohibited. We can consider a currency if everyone will agree and willing to adapt to several changes which inVolves technicalities that is sure to be given since Bitcoin is a brainchild of technology.