<quote who="James Salsman" date="Sat, Sep 13, 2014 at 02:52:54PM -1000">
My opinion is that the transition from the need to create new articles to maintaining the accuracy and quality of existing articles has been the primary cause of editor attrition, and my studies of Short Popular Vital Articles (WP:SPVA) have supported this hypothesis.
My understanding is that we've seen similar trends in attrition across many (but not all) language Wikipedias despite the fact that number of articles varies quite a lot across these languages languages. Do your studies address this issue?
Regards, Mako