"History has shown that there will always be work for humans."
Unemployment has been a very real issue and as machine learning could mean that no segment of employment is untouched. Jobs classified today as "white collar" could one day be done by AI. And I worry too that the pace things are changing will be faster than I or most can humanly keep up with.
Again, the fundamental structure of the economy would have to radically change so that everyone could benefit as equally as possible from machines doing most of the work. If so, then it would be positive for all humanity.