As exciting as these new technologies may be, a key insight that I have taken away from the discussions I have had over the last couple of years is that people care a lot about the coins and banknotes they keep in their pockets. Cash is something that everyone understands and has a view on.
Research, of course, has to go beyond mere expressions of opinion. Central bankers and researchers in the area of cash need to understand the fundamental drivers of cash circulation 1/5  BIS central bankers' speeches  and establish microeconomic evidence on cash usage. Cash passed the conceptual stage centuries ago. It has been around ever since.