Or it could end up like the music store. I've never heard anyone complain about it being hard to get music published. The same could be said about books or movies.
Given that apple only deals with musicians who are represented by a label and distributor, not independent artists, I think the itunes music store would be a kind of worst case scenario for a hypothetical podcast store.
> I've never heard anyone complain about it being hard to get music published.
I can't tell if you're being sarcastic or not, but if not... that is absolutely not what I have ever heard. The iTMS is brutal to independent artists and getting on it is a huge barrier to entry. It's perhaps an improvement from the 1990s system of record-label distribution (which perhaps keeps the complaints to a low volume; Apple can always point to that particular horror if the plebes get out of line), but it's in no way an open platform.
Most independent music I listen to tends to be hosted on Soundcloud, largely as a result of Apple's policies on the iTMS.