[lazerwalker]

You don't think moving people away from physically using cards for the transactions is a big first step?

With the transaction taking place without any physical handling of any paper or plastic, using a card as a payment source is just an implementation detail. It'll be trivial in the future for Square to add alternate funding sources without any pain to the user, and in the mean time it drives adoption because people are already used to the idea of giving Square their credit card info.