Smartphones May Soon Replace Credit Cards

I'd like to see credit card send instant notifications that you can reply to reject the transaction. Assuming they can do it quickly enough, this could make it very difficult for even a clerk to use your card for anything but your purchase.

The first paragraph then says

"Smartphones may soon displace some of the estimated 1 billion credit and debit cards in American wallets."

which is a rather different and less drastic change; they're no more replacing credit cards than credit cards replaced money