Offices used to be full of book keepers with paper ledgers. All shops employed them, in fact every business need them. Every improvement in technology has either reduced the number of people needed to do the work, or increased the efficiency of the workers, allowing them to achieve more. This has been going on since the start of the industrial age and is still continuing. The percentage of people employed in agriculture is at an all time low. There's nothing to indicate this trend won't continue unabated, and advanced AI will be yet another step change impacting a variety of jobs.