I'm not an expert at radio broadcasting, but my dad is a radio show host at a small, non-profit radio station. He's always telling me how, at the bigger radio stations, they hire loads of people, and they end up making a LOT of money.
I think a lot of those people are more behind the scenes than just announcers, so it depends on what angle you want to go at it. I'm betting that if you wanted to go into radio production/technology/marketing, you'd find a lot more jobs.
Hope this helped!

The competition within the radio broadcasting market can seem volatile, but most of it is for entertainment.