Newspaper -> Radio -> TV
Blogs -> Podcasts -> ? "Videocasts"
The price will continue to drop on personal video players, so does that mean that we will soon start seeing "videocasts" that you can subscribe to via RSS? Probably so. Grab your Mac and your iSight and go make some visual documentaries; what would be really cool and something to think about would be publishing both the video and audio from the same content as both video- and Podcasts (you'd have to give some though to the fact that people listening would have no visual cues to what you were talking about). Perhaps a video conferencing add-in to Skype would drastically improve the speed at which this happens -- imagine posting a recording of the company videoconference call on the internal website.
All I know is that we've seen this before as evidenced above.