The way in which technology replaces jobs is not usually explicit. Cell phones and email and automated voice mail systems replaced a lot of receptionists. Desktop computers replaced pretty much all the typists in the typing pool and a many secretaries. Smart phones replaced a lot of the secretaries that were left.

The thing about AI is that it doesn't seem like AI in the rear view mirror. Grammar check and voice recognition don't seem like a big deal twenty years later. But it was science fiction in real life twenty years ago.