So, who hasn't bitched (at least in your mind) about standing in a grocery line? Especially around the holidays? Why would you NOT welcome technology to alleviate this? Is everyone supposed to feel sorry whomever in the world may be impacted in terms of their employment? Get a life. Good for Amazon. That system sounds wonderful for some people. I don't have a smart phone (my flip phone does all I need right now), so it won't work for me right now, but good for them. Eventually it will be a smart phone-only world and I'll have to capitulate, so I will.
Like someone said, technology provides other types of jobs, including technical skills to repair the technology/machines when they go down, and they will. Get with the program.
Hopefully, companies who improve technology to improve customer service (and save/make money for the company--companies deserve to make some profit) offer other positions and/or training for new positions. If one is too lazy, or resistant, to accept or seek training to qualify for a better or different job, then tough luck. Necessity is the mother of invention. Hit the bricks, apply for everything, check out the Vo-tech programs. Don't just sit and whine.
By the way, when you get a job, be the best grocery sacker, the best burger flipper, the best shelf stocker with the best attitude in the place. You'll be noticed by customers and managers and eventually (be patient!) offered more opportunities. If you act surly, gripe about your working conditions, call in sick a lot, you should expect to see the guy next to you with the great attitude pass you up for a better position, with race, creed, color, age, religion, handicap etc. having nothing to do with it, though you can use those excuses if you must to make yourself feel better.