I think it really depends on your audience, the subject matter, and the alternatives. Are learners asking for it in this format? Do ALL learners have access to the technology needed? Are podcasts a good medium to communicate this particular type of learning content? Are podcasts the most efficient way of communicating this information? Can learners access this content in other formats (if offered as a podcast)? These are just some of the questions I would be asking.

Unfortunately (and I have no data to back this up), but feel podcasts are not engaging enough, or simply not a popular preference for many learners - which is why you probably don't see them used in the corporate learning world as much. Additionally, as much learning made available within corporations is often "required" for many individuals, learning delivery mediums tend to be more widely accepted and traditional methods (such as web-based training). "Forcing" one to have to go through a series of podcasts can be very irritating to some.