The bigger problem that Wiki had had for years now, is the lack of new contributors. That is in part due to people visiting the site less, but reader growth and contributor growth have never quite correlated - which is also normal as a project is more widely used. We see this everywhere in open source too.
PS: I used to work work for Wikimedia DEs volunteer support a few years back, and still know and follow the folks I know from that time, who are some of the most active users