The challenge of keeping down the forgeries and counterfeits will still be there, but, how its done will be very different from a world dominated by paper currency and paper checks. Collecting deposits and making loans will continue to diminish as the generic business of banking. But, the task of assuring that financial intermediaries are reasonably sound, free of fraud and embezzlement, and not politicized, will still be assigned to someone. Failure includes financial instability of such proportions that intermediation and risk-bearing services do not facilitate economic growth. Failure includes capital flight and the inability to promote sufficient investment to support economic growth.
Failure includes unreliable payment clearing and settlement systems.
Failure includes corrupt or politicized financial systems. When a central bank is perceived as successful in its core missions, it is important to resist the acceptance of assignments that might diminish the likelihood of future success. Central banks could become stretched too thin, or become distracted, the same as any other organization. Throughout the history of central banking nations have differed on the appropriate missions of their central bank. Differing views exist today and will continue to evolve.