Plenty of cheaper restaurants here in Japan - chain izakayas especially - have used terminals for ordering for years already. And while they certainly do it in part to reduce staff, the fact is that many customers like it. You don't have to flag down a waiter to place an order, and you can always see exactly what you've ordered, what dishes you've yet to receive and your current tab.
Also, the basic truth is that if your job can be automated, no wage level will compete with it in the long run. If you accept wage cuts to avoid being replaced by automation, you've only bought yourself a few years, and at a lower salary than you're worth at that.