User blog comment:Rappy 4187/Technical Update: September 7, 2015/@comment-24545405-20150908014213/@comment-24473195-20150908103916

Well, one of the top WAM wikias has about 272 messages. If one  makes an educated estimate that perhaps less than 300 mediawiki pages are used by most wikias, then it would take them a bit over a year to clear them all up.

The point is that most messages aren't used, most aren't even known by either users or admins,  and would likely still not be used even if all mediawiki pages were unlocked. There are well over 5000 system messages (MediaWiki pages).