I can't help but notice MediaWiki's popularity seems to be in a steady decline. A number of former groups and websites which ran on MediaWiki no longer exist and I've not seen a lot of new popular MediaWiki based sites. Wikipedia itself has had a declining number of active editors for years and I'm thinking the two may be related due to fewer experienced Wikipedians forming their own MediaWiki powered websites.
Does anyone have any download or other stats which can shed some light as to whether MediaWiki remains popular? Has participation on MediaWiki.org itself increased, remained constant, or declined?