Another example: if presented with a podcast with transcript, I'll almost always read the transcript than listen. Unless the speaker is someone I'm really engag

Another example: if presented with a podcast with transcript, I'll almost always read the transcript than listen. Unless the speaker is someone I'm really engaged to hear specifically I prefer to skim in order to rapidly gather the information (see NPRs audio/transcript style for example, I love that they do this). And who would listen to a 'radio' station made of music generated by an iPad app? You can give someone the most advanced creation tools in the world and if they are not inherently a musician it's going to be a series of notes, not 'music'. I agree with you that his argument is not convincing, though there is certainly a huge space for innovation yet to come with audio creators and connecting them with listeners. Soundcloud is doing pretty well on this front so far.