Audiobooks Silenced?

Audiobooks have been hailed as an ever-expanding market for voice artists to tap into, but recent numbers are telling a disturbingly different tale. A recent AP article notes that audiobook sales for 2009 are down 20 per cent from last year, with publishers seeing a whiplash-inducing 47 per cent drop in revenue from the medium.*
What's causing the audiobook to lose ground? Clive Young at ProSoundNews cites the ever-growing list of alternate media options, combined with popular titles' higher price tags compared to their paper counterparts. However, Young also suggests ways in which social media could play a role in reviving the format.
Information and entertainment mediums of all types are undergoing radical changes these days, and the audiobook appears to be no exception.
*The article notes that the Nielsen scan data used doesn't take digital downloads into account, but publishers are still not optimistic about the overall trend.