Berkholz, a long-time X.Org and Gentoo contributor and employee of RedMonk, also reiterated facts about the X.Org Foundation not being accepted to the Google Summer of Code project last year and other shortcomings. His development statistics on X.Org slowing down in the past few years incorporates not only code activity but also mailing list messages, contributor count, and other metrics.
Last year I wrote a similar piece on To No Surprise, X.Org Server Progress Is Slowing. Additionally, Mesa's Rate Of Git Development Is Slowing while Wayland Development Continues Picking Up and Intel X.Org Driver Explodes Thanks To Chris Wilson.
Embedded below is the Donnie Berkholz's FOSDEM 2013 presentation.