Search Engine Land has a Sept 2015 article on the topic of reduced ranking of Wikipedia:
Some of the traffic to WMF will be replaced by different interaction methods of asking questions, eg: "ok google, what is the capital of france => "The capital of Francis is Paris"; and by direct answers on the SERP, eg: "who is mark twain"[1] returns a direct answer at the top, referencing
biography.com, along with an knowledge pane on the right sourced from Wikipedia and likely other mixed sources.
I think having traffic replaced by direct answers is still a good thing as it fits within the mission[2] and vision[3] of WMF of disseminating knowledge. The primary downside I see is the shallowness of the knowledge presented; the quick answer lacks the discovery aspect of going to a full wiki article and becoming lost delving numerous links deep.