Although I dont think the dollar will vanish completely, bitcoin definitely will need atleast 50 years to become a globally used currency. Big changes like that dont happen overnight guys.
yes ofcourse, we are discussing an economic revolution with some people speculating bitcoin could be used by everybody globally. I just can't adapt to such an idea because I see how gold has there for centuries, it still has great value, fiat has been super long and now bringing bitcoin to the fight, it seems bitcoin is just lacking experience. A lot of things can obviously be altered, as times change.
Theoretically it could be done in 5-7 years, but since the inertia of the masses, people evolve very slowly, and dont really like new things.
Bitcoin is so innovative and new that many people cant comprehend it, in my country most guys dont even have a bank account.
I think in countries where banking is popular, bitcoin could be faster,but where it is not there it might need more time for people to adapt.
Best case scenario is about 15 years, i`d give. Worst case scenario 60-70 years.
worst case scenario: never