One Time Display Password

StorefrontBackTalk reports that Mastercard is experimenting with a one time use password display. This approach has been used for access to secure resources for some time, but the card used was likely too expensive for general distribution. Also as a commenter asks, how would this be used in a restaurant, where the server leaves with the card? They could be given the one-time pin before leaving the table, or the process would need to be otherwise altered.