Electronic computers 'destroyed' jobs when they replaced human computers.
Motorized street sweepers 'destroyed' jobs when they replaced people with brooms sweeping debris off of streets (except in Beijing where, as of 2015, this is still a thing).
Firearms 'destroyed' jobs when bowers no longer had any reason to mass produce bows and arrows.
People will find a way to stay busy. The past is literally filled with examples of a new technology replacing people, and those people eventually found other things to do. It's not hard to see, in hindsight, how many of my silly (but real) examples above translated into entirely new industries.
Pardon the harshness here, I feel like the only people this is truly a surprise to is either folks that ignore the past, or are incapable of understanding the past.