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?
If the dollar currency is erased then all fiat currencies in the world will also be the same, it will be harmful to the ecosystem and economic sovereignty, if bitcoin replaces it all, it will wipe out all the old bureaucracy and conspiracy, this will cause a big war because every country will claim to have bitcoin.
i don't think it will ever replace the dollar but it will rather coexist with the dollar and other fiats as our media of exchange and per the strength of each we will use it for the purpose well suited for it. Banks and governments are going quickly for the blockchain technology and i bet they will dio everything to secure their fiats wuith it also.