Inevitable. My local convenience store has a sandwich section with several touchscreens. You can dither in front of the touchscreen figuring out if you want mayo or vinegar and oil on your sandwich without taking up a human's time. When you're done, it prints out your order for the preparer, you pay for it, and then wait for her to call out your number.
“McDonald’s orders 7,000 touchscreen kiosks to replace cashiers”
I stopped in a McDonalds yesterday to potty, and then considered buying a snack while there. I stood in line for about 60 seconds...realized the minimum-wagers behind the counter looked just as forlorn and disheveled as the weird customers on my side of the counter...really got kind of spooked...and left.