(If you’re curious -- in our tests, removing authorship generally does not seem to reduce traffic to sites. Nor does it increase clicks on ads. We make these kinds of changes to improve our users’ experience.)
On a personal note, it's been fun and interesting travelling the road of authorship with all of you. There have been weird quirks, bugs, some spam to fight, but the most rewarding thing has been (and will continue to be) interacting with webmasters themselves. We realize authorship wasn't always easy to implement, and we greatly appreciate the effort you put into continually improving your sites for your users. Thank you!
Going forward, we're strongly committed to continuing and expanding our support of structured markup (such as schema.org). This markup helps all search engines better understand the content and context of pages on the web, and we'll continue to use it to show rich snippets in search results.
It’s also worth mentioning that Search users will still see Google+ posts from friends and pages when they’re relevant to the query — both in the main results, and on the right-hand side. Today’s authorship change doesn’t impact these social features.
As always, we’ll keep expanding and improving the set of free tools we provide to make it easier for you to optimize your sites. Thank you again, and please keep the feedback coming.