These are not high end audio, but they do allow you access to everything on the radio. As a result, the average American home has over 5 radios, and if needed anyone can be near a radio within minutes. If we assume there are now some 50 million people with access to the World Wide Web, that is only a 6th of the entire US population, which I trust you will agree has the most access of any other country. This is a very small percentage - and is made up of those with some 'discretionary income'. The majority of the population will need a pretty good reason to spend that kind of money to get connected.
Worthwhile content is essential.
I hear what I choose to hear. And I generally hear quality programming. On radio, the techies manage technology - professionals provide content. The information has to be useful. For myself, browsing at random can be enjoyable pastime, but I don't believe it will be for the majority of the public.