> Analytics are the equivalent of a computer following you around the store, watching what you look at, how long you look at it, what you pick up, what you pull out of your cart and put back...

I hate to break it to you, but that's already happening too. Many retailers are using NFC/RFID + door scanners combined with CCTV and computer vision to track exactly these sorts of things, as well as patterns of flow. Retail store layout is a critical part of product placement optimization and is used to create particular flows through the store. The most blatant example of store layout controlling flow is how an IKEA is designed, however these things are used very heavily in grocery and mixed retail spaces (Walmart, Target).