Has the Authorship Purge Bottomed Out?

The screen cap below is from the +Moz MozCast Google Feature Graph for Authorship in SERPs. The Feature Graph tracks the occurrence of various special features of Google Search across a wide variety of sample queries.

As many of you know by now, over the past two weeks or so Google has begun to reduce the amount of Authorship rich snippets it shows in search, as Matt Cutts had promised they would do. For details, see my post at http://goo.gl/ViGqfZ

From the Mozcast graph, it looks like the purge may have finally bottomed out, which would mean I can finally start trying to do a final assessment of the damage.

If the Mozcast sampling is accurately representative of Google SERPs in general, we've had about a 3% reduction in queries showing Authorship results. Of course, the actual percentage of reduced Authorship results would be much larger than that, since many queries were showing more than one per SERP. At Pubcon this year, Matt Cutts hinted that it would be around 15%.
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