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Who builds the machines?
That, and changing technologies bring changing employment. There are not hordes of unemployed saddle makers or street cleaners due to the shift from horses to mechanized travel. Periods of transition stink for those involved, and you'll find upheaval as people move to where there is employment and as people find new jobs. But, they are periods of transition. It would be meaningless to speculate just what jobs might arise, because most likely it will be an industry that doesn't yet exist.
That's what's happened as technology shifts.