This business about people losing jobs because of the auto-tills is a non-starter. Nobody chose to train as a checkout operator as a career path - if the supermarket is not actively trying to reduce staffing, they will be redeployed in the same place. Many employees divide their time between checkout, customer services, stock control, shelf staking etc.
And if the supermarket IS actively trying to reduce staff, it's a way of balancing the books. Say they need to lose ten staff members - it's just as likelihood that they will operate, say, a last-in-first-out policy, rather than saying " we'll cut ten checkout operators because we can't use those people for any other work"
You have to remember that a supermarket, like any other business, is notes a charity. If a business doesn't make a profit (which some people think is a dirty word) it goes out of business, simple as that. No business is going to keep staff out of the goodness of its heart.
As to whether we like the auto-tills, that's a separate issue. I'm quite happy with them whenever there's a long queue for the manned checkouts. I'll use whichever is quickest. And some places have one supervisor on hand to deal quickly with problems at the machines.