In the meantime, if you’re looking to get your audiobooks playing on Sonos, we can offer some suggestions here.
Update February 8, 2017: We know a lot of Audible fans are eager to get Audible back working on their Sonos systems and we’re pleased to announce that Sonos and Audible have committed to bringing Audible back to Sonos soon. Please bear with us—we appreciate your patience!
Best answer by Ryan S