as the younger population grows into their late 20s and does their own shopping for families, they will want self-check. i use walmart and the system is very good and easy to use.
In our area the last of the hold outs Staters is now going self check. No conversations holding up the line no pulling out the checkbook and calling the manager. Very few backed up lines. I like SC very much and go to that area when it is available.
People put out of jobs will have to adapt and retrain as they have since before the industrial revolution. How many of you support your local black smith in cities or phone switchboard women.