My old brief aborted career was in radio. The same thing happened there. Voice tracking and automation replaced tons of jobs.
Here's how it works. Joe DJ (who not even live in the same state) is given a playlist for a 6 hour shift. They also give him some info on local news and events. He spends an hour recording all the talk for that shift. Someone pieces it together with the music and stores it on a hard drive. When the shift starts, they play the thing and it sounds just like a live DJ.
And that's "My Generation" by The Who, and before that we had "Bad Moon Rising" by CCR, and that li'l ol' band from Texas singing about that shack outside Lagrange. It's 23 past the hour and... what about those playoffs? Will the Lakers pull it off tonight or can the Clippers stay alive? Speaking of clippers, head on over to Great Clips this weekend where you can get a men's haircut for $10.75 just by mentioning my name, that's Classic Carl, from Hits 107.5! We'll have news at the bottom of the hour but first, here's a guitar classic by a guitar god, and it's "Layla."
All the radio veterans said it would kill jobs and that the public would hate it. It got rid of some jobs but the public never cared if they noticed it at all.