Originally Posted by braumeister
Electronic payment (wave your phone at the machine) is already becoming common in parts of Europe, so that's a natural question.
However, I think it might underestimate [sorry, I guess that's misunderestimate
] the inertia of the average American.
AFAIK, there are only one or two tiny countries in the world besides the USA that still use anything but the SI metric system, but I don't see us making much of an effort to upgrade in that area.
What is this metric system of which you speak?
Although electronic cash won't be a requirement for a long time (except if you want to buy refreshments on airplanes, where you already must use credit cards), it will happen sooner rather than later because there is money to be saved by business in not handling cash. We'll probably all do it using smart phones, too.
One day a grandfather will be telling his grandchildren all about people who used to come to our houses every day with things called "letters" and about machines that gave us "bills" and "coins" that we used to buy "newspapers.".