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.
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Bitcoin may not become a universal world currency but i can guarantee you that a cryptocurrency and not a central gov't based fiat currency may become a universal world currency. The technological advancements brought by Bitcoin and the innovation in the crypto/blockchain field is still in its early years but is laying out the foundation for groundbreaking discoveries to occur in the future.