The main purpose of a disc jockey is to identify the music that he or she is playing and to decide which music to play. Now that users can decide for themselves what they want to hear, and they have apps which identify the music to which they are listening, as well as other internet resources to give them news, weather, sports, and so on, the disk jockey is no longer necessary and is becoming a thing of the past.
Although online radio is a huge trend that has been taking off fast here lately, many people still enjoy tuning in to local music channels on their radio to get entertained. I think good jockeys will not have to worry about their station being shut down because of internet radio.
I believe that disc jockeys are not in danger to losing their jobs thanks to Internet radio. Even though Internet radio can provide music they cannot provide the human element like disc jockeys. Lots of disc jockeys have a great personality and can make announcements, take song requests and talk to the crowd, something an Internet radio station cannot do.
No, disc jockeys need not fear losing their jobs--at least not for some time to come. Although Internet radio's fan base is quickly growing, it has not as yet invaded the sanctity of our cars. Disc jockeys become travel companions feeding us new artists and songs to listen to during commuting times and they are much beloved. As long as there's a place to drive to, live radio stations and human disc jockeys will be what listeners go to for their music and talk radio content while on the road.
Disc jokeys are in danger to losing their jobs, but "internet radio" has nothing to do with it. Most stations these days are automated and use something called voice tracking. This means one DJ goes into a booth once or twice a week and records a bunch of sound bites to be played between songs. Radio station corporations then can use 1 DJ across hundreds of stations. Why bother with local talent any more?