The fact that wages have stagnated while productivity has skyrocketed is proof that there is insufficient and possibly decreasing demand for labor.
Personally, I like all the new automated services, and I would say the benefits have outweighed the issues. The gaps in the system don’t require as many people as before to fill, or perhaps the ones that are required don’t need to be as highly trained so they offer lower pay.
For example, Home Depot and Lowe’s websites now show you exactly where an item is in the store, which is very helpful to a shopper. But that may also cause some employees to be made redundant as they theoretically have more time to assist with other things assuming they are helping fewer customers find things. This one change might not affect the numbers, but combined with online ordering, in store pickup, self checkout machines, it might all add up to a few less positions at the store.