I was just thinking that...or some type of invisible (to human eye) laser setup. These systems all rely on cameras so why not take advantage of the camera weak spot. Would be awesome to build something that makes you look like a blurred out blob on the camera, but doesn't render their system useless while you're using it.

The quick solution for retailers would be banning use of IR/lasers in-store and they'll play the "if you don't like it you can shop elsewhere" game.