I honestly don’t think that style of dystopia will require cameras at all. My best hunch here is that the self-checkout will migrate to the new “scan while you shop” model. Associating your personal scanning wand with, well, you is all it takes at that point.

Meanwhile what we’re looking at here is Walmart solving the problem of not having a good look at a shoplifter’s face, since there is no better place to stick a camera in their comically proportioned warehouse-sized stores.