Podcast: the challenge of radio?

Since Podcast becomes an assignment for us in the media convergence class, I have to get to know about it even if I never heard about it before.
I read a paper today which talks about the emergence of podcast makes the traditional radio industry face the big challenge since everyone can easily subscribe the content from podcast with easy -get sofeware. I have to say, this is the similar question about whether the newspaper will disappear, both the survival discussion about the traditional media.
However, I still believe that everything exists to some reasons and the traditional radio station will not disappear sooner, at least in China, due to its special characters. In the city where I was living in China, the radio is the main and most important medium for a special group of people – taxi drivers.The taxi drivers drive the cars all day and they can hardly spend too much time on the other media. When they drive the cars, listening to the radio is the only way for entertaining and getting the news. Besides, there are several radio stations particularly prepared for the taxi drivers, called communication radio stations. In other words, the taxi drivers are the target audience of these radio stations. They provides the traffic information for the taxi drivers such as which block is in jam, the entertaining programmes such as talk show which closely related to the taxi drivers lives and the interactive programmes such as the drivers can call in to do some little competitive games. Besides, the radio stations also hold the parties which the radiobroadcasters and the taxi drivers can communicate. This makes the taxi drivers to feel like they have another family.
In short, some particular media will exist until the day when there is no need for it to exist. But before that, it can exert its particular effect which cannot be replaced by others.