That’s on the way. Major shopping centres are making it a condition of entry that they can track you via mobile devices when you enter, and surveillance cameras in-store are being used to drive software that captures visitor behaviour by tracking them, noting what they look at, and generally attempting to bring the sort of customer behaviour metric granularity currently available online to bricks and mortar.
Four Corners (Australian current affairs program) did a show about it a few weeks ago. It’s fucking terrifying.