Scanning a Barcode to Save your Place in Line

A simple clever idea in Mashable: " ... Scan QR codes to save your place on multiple wait lists.Proving that nine guys can successfully launch a startup in 48 hours on a bus, WalkIN is walking away from SXSW Interactive a big winner. The now one-week-old startup, which lets users save their places on restaurant wait lists by scanning a QR code at the door' ....   But does it go away once more general location sensing becomes common?