Plopping a big, fat style guide on a coworker’s desk and saying ‘memorize this and then write me something’ is only going to scare them off. Instead, make style guides available for reference only, and focus on teaching new writers what they really need to know. At MailChimp, our voice and tone guide is required reading, but our traditional style guide (we use the Yahoo! style guide) is not.
Kate Kiefer Lee wrote this in Writing With Experts on her blog. It is a good point about the proper place of style guides in editorial workflows.