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.
He just said it that not all are able to adopt it due to some reasons like lack of knowledge or budget to have a device that supports the technology but obviously it is convenient for those who always seeks for it since they don't have any of those problems that I mentioned earlier except maybe if the person that they are trying to send cashless payments are from those unsupported areas, you know there are areas where no signal, electricity, internet but I believe that they won't be like that forever as I already saw some far areas which are improving.
Soon almost all people are now going to enjoy the benefits of these new technologies that we are seeing today.