I believe that bitcoin in the future will have enormous power and can also be used to perform financial transactions in various sectors. maybe bitcoin could be a highly desirable currency in the future. but to replace real money / fiat I think it will be very difficult. there must be a highly supportive infrastructure for transactions. because the fact may be in the future also there are still areas that still want conventional transactions, all will be affected by the culture of citizens in a place. for urban areas I am very sure this could have been realized. but the conclusion that fiat is still needed in the future and can not be eliminated completely.