Merge of video & radio

After listening to Kerstin Brunnberg I started to think about how her view of radio would fit in the media landscape 10-20 years from now. And I realized that it probably won't. The spread of video on demand (VOD) is increasing as well as other other streamings for sound and video. Will there even be anything other than digital radio? And why would anyone settle for sound only, when you can have a video as well. And if radio can be experienced on a video stream, is it still then radio, or just video streaming?