Re: Do you think Bitcoin will become the first world currency for buy and sell ?
Nonsense 
It will be important part of the way we pay for stuff but NO.1 no way, there will be more and more options and usd,eur,yen,yuan are also here to stay.Maybe usd and euro will go on blockchain some day in the future,cryptocurrencies are here to stay but they wont be THE ONLY option.
Exactly. I only think that Bitcoin, or cryptocurrencies in general, will only co-exist with the existing currencies, the fiat money. I do not think that the government and the banks will allow a country's currency to be replaces by something that exists only in the internet. It will be important part of the way we pay for stuff but NO.1 no way, there will be more and more options and usd,eur,yen,yuan are also here to stay.Maybe usd and euro will go on blockchain some day in the future,cryptocurrencies are here to stay but they wont be THE ONLY option.