Coinbase CEO believes bitcoin will replace dollar within 15 years.

Read the following news:
http://cointelegraph.com/news/114983/coinbase-ceo-bitcoin-will-replace-dollar-within-15-years

Do you think it will be true? Are you positive towards bitcoin's future status?
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i don't think that could be happen because dollar is our international currency but if that will be happen within 15 years from now that could be possible and we know that bitcoin now is very popular in the world.