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.
Yes, you are right. Bitcoin can be the world's currency. But does the government in every country give permission. In some countries they have laws to use currency. So let's encourage the government to legalize Bitcoin as a means of payment.