I really don't agree with this notion that written communication will be superseded by podcasts, etc. Paper may be replaced by pixels, but people are always going to want to read, and more importantly, skim. Skimming an audio file is a pain in the butt. You are at the mercy of whoever's talking, you can't intuitively jump a couple paragraphs ahead when it starts to get slow. Plus, a person who may be a fast-paced quick witted writer, may be slow, stuttering, and horrible with their delivery.