Here in Barcelona we're using wireless for paying. Each card has a chip you just get your card close to the read and bam, you payed the bill. It's nice and confortable.
I've seen it at CVS, RiteAid, McDonalds, Wawa, ShopRite, Home Depot...
On a credit card you have the safety of being able to appeal transactions. I wouldn't want this on a debit card.
Each time you pass the card on a place like that it destroy itself, specially if the clerk doesn't have a good day, they just smash the cards until they can't be read.
I replaced 3 cards in a year before the tap system.