Well if someone comes up with, and popularizes a system that can actually replace cash then we should consider it. I would be thrilled to use something like bit

Well if someone comes up with, and popularizes a system that can actually replace cash then we should consider it. I would be thrilled to use something like bitcoin or taler to pay for my groceries. In the mean time we are stuck with physical cash. Credit and debit systems are good for some stuff but are simply not technologically advanced enough to replace cash. In fact, actual electronic cash would to some extent make credit and debit obsolete, as well as causing a great many other changes.