Content creation at Wikipedia is slowing down. The already small number of active regular editors is on the decline and Jimmy Wales has called for live edits to be held for approval on many pages, a step sure to slow contributions even further.
N. Sahri, and K. Okamura. Proceedings of The Ninth International Conference on Future Internet Technologies, page 16:1--16:2. New York, NY, USA, ACM, (2014)