Actually, no, it doesn't worry me because I meant the same percentage listen to radio as did 20 years ago. It's in the 90% range. That figure has been remarkably consistent for decades. Sorry if I didn't make that point clearly the first time.
However, as I said before, I don't think it means radio should take that statistic for granted nor do I think it justifies skipping on-demand content. When you have the means to get people that favorite morning show whenever they want it, why should you not take advantage of that? I, for example, hate listening to a traditional morning show on the drive to work, but I do enjoy it when actually working or over lunch. With podcasts, I can get my favorite morning show when I want it, and the radio station knows exactly how many people download each podcast and should be able to sell that audience.