Everything you mentioned is a negative for traditional radio.
Podcasting became "a thing" many years ago, but it's experiencing a 'Renaissance' in 2014, which means that it's "coming back" to put it simply.
What is actually different in 2014 that makes podcasts successful?
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I personally believe it's the success of internet connected mobile devices. Your phone is a true functional replacement for your car radio. Today, you can TRIVIALLY listen to live or prerecorded podcasts.
In 2006 you would have to pre-download everything you wanted to listen to, using a PC or a Laptop. If you wanted to listen to something on a whim, your only choice was radio.
Today, you can see a tweet from someone you follow, tap a link, and listen without any technical knowledge.