The sooner the better IMHO. Back in the late 60s I worked at a restaurant that had phones in each booth and drive-up area and people called in their own orders. Worked great and this is just the modern-day equivalent.
I’ve never enjoyed shopping at Wal-mart but it’s at least tolerable now that I can check myself out using the self-scan machines.
We had an A&W in the Detroit area that had those phones back in the ‘80s.