Per an announcement on the home page, DMOZ (The Open Directory Project) is shutting down permanently on March 14, 2017.
Many, if not all, of the questions tagged dmoz are now stale and should probably be closed.
The OP answered one of these questions titled Is DMOZ still 'active'? with the information about the announcement that DMOZ was closing. The About section of the DMOZ tag had also been updated to reflect this announcement.
There are questions like How can I add my website to DMOZ? that visitors might still find in the future. We should lock those to prevent useless/spam answers, but also include a link to the above question "Is DMOZ still 'active'?" so that users can view the history of answers there, and once it does close, that can be updated and then also locked.
Any future questions related to DMOZ can then be closed with an explanation linking to "Is DMOZ still 'active'?" so that additional questions do not get added to the site, since they'll automatically be removed after 30 days.
That way we can maintain the historical perspective that Gypsy Spellweaver suggested, with a time-line related to DMOZ's closing attached to them.