I do not know the full history, but all wikis in the constructed language "Toki pona" have been closed for several years now (with the exception of the Wikiquote, which was closed in July this year). None of the wikis have any content, and there is no point in still keeping the subdomains up.
I do not think it is necessary to gather a consensus to delete these wikis, as they are in no way useful to anyone. If a consensus has to be gathered, then I'm sure that would be no problem.
Version: unspecified
Severity: normal
URL: http://meta.wikimedia.org/w/index.php?title=Proposals_for_closing_projects/Deletion_of_Toki_Pona_Wikimedia_projects&oldid=1436284