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.
To be a world currency taste it difficult because Bitcoin is supported by modern technology, and this is uneven in the environment, because of the difference between the rich and the poor, I am pessimistic with the world currency. but Bitcoin's currency functions look more favorably to the rich who have money and modern technological tools.