Bitcoin does have a lot of chances that it will become the world's crytocurrency.
Bitcoin will become the most famous currency and nothing can stop that.
I am dam sure bitcoin will replace the dollar soon.Upto now the dollar equalant value of bitcoin is 3351$.If all the trading and investing is made by bitcoin means .Their is no doubt to became world currency and make the paper currency will not live or make to disappear. Bitcoin is our future currency.
although the possibilities are always there but still we are not sure about that, that it will replace dollar so soon. because USD is still the most powerful currency of the world, in fact the users of bitcoin are still very low therefore we still cannot expect that bitcoin will replace dollar soon, may be in future when bitcoin users will increase too much and everyone in the world start using bitcoin may be then bitcoin will replace USD.