I'd thought about it as well that will it be that convenient for everyone to go cashless same time since the development is not everywhere, the only countries to benefit that most are the developed ones, but we can't overlooked their relevances both in the role they play for the payment of goods and services in the world economical system, come to think of it this wat that bulkiness in cash is no more necessary in making payments while there are instances whereby cash is more needed because of the conditions surrounding it, the two need to be in use and i think bitcoin itself have solve alots of potential potholes in fiat cashless policy and regulations around it, no limitations in bitcoin transactions unlike in fiat.