I honestly don't think it'll happen, certainly not in 15 years... In 100 years maybe?
Lol, how did you say that? and how did you know that after 100 years bitcoin will replace dollar. Nobody knows what will happen tomorrow, but there is a possibility to be happen that bitcoin can replace dollar depending on how the people around the world will adopt bitcoins.
Agree with you. Crypto currency is very unpredictable and it makes no sense to make long forecasts. But even if the crypto currency becomes very popular, I'm not sure that it will replace the dollar
Indeed, bitcoin and altcoin are unstable in terms of price and they are not accepted everywhere and they dont have big market compared to the dollar which is accepted all over the world, so this topic should be closed a long time ago because we can never replace the fiat with cryptocurrency at least not at the current state.
On the other hand, when people decide to go only for digital transactions, we could not expect dollars to survive. At the same time there will be no surety that bitcoin will be the only digital payment system for people at those times.