Think of all the jobs that the invention of the wheel eliminated? What about the combustion engine? Electricity alone has surely cost countless millions of jobs. Using petroleum as a lubricant is one of many hidden job killers since it keeps machines from wearing out — eliminating more repair jobs. My personal pet peeve is any use of an alloy that causes things to last a really long time — thereby screwing over countless workers who would have otherwise had a great job repairing broken stuff.
But the odd thing is that even with all this job-eliminating technology, we still maintain a fully employed economy?? Generally 2 to 5% unemployment. Hmmm… maybe when technology reduces the need for one thing, people accept the improved standard of living (Yay!) and then just focus on new needs, which creates new demand in new areas?
In fact, maybe we are better off just enjoying the benefits of technology and letting displaced workers find their own new way to add value based on everyone voting freely with their feet and dollars — as has worked extremely well so far.