Get with the times Doc. I had a Great Uncle (6th grade education) who was quite an entreprenure & visionary. When I was around 10, he told me that one day there would be no need for money. Everyone would have a card which they would show to make a purchase. He also told me we would be able to get on the phone, tell a business our name, and be albe to buy anything we want, and not even have to go get it. This was well before home computers or the internet.
Radio Frequency Identification (RFID) has been in use for years (Pike Pass, etc.), but is still too pricey to fit into our everyday lifestyle. The likely hood of RFID, or something very similar, used for our daily purchases, and our individual identification is eminent. I predict we will be currency (and card) free within 10 years, probably 5.
Rather than assuming the role of techno-skeptic, we should adopt the insight that when revolutionary technologies are introduced into a culture they ultimately yield something fundamentally new. JMO