For what it's worth, this is just restating some research that's been ongoing since at least 2008. I think the final nails in that coffin were established in the "Summer of Research" in 2011. There's no doubt that the decline in editorship is due to endogenous, not exogenous factors.

The WMF are not "finally" coming around to this realization; they are trying to convince the rest of the community to make it a higher priority, and to publicize the efforts they're making to the press.