User blog comment:Cristina7/Introducing Discussions, a New Platform For Engaging Your Community/@comment-26938148-20161218032401/@comment-24258073-20161218035926

If a wiki community wants the discussions feature to be enabled then they'd have to request it via Special:Contact, though on a larger wiki with a larger wiki, there would probably need to be a consensus first. All the wikis will eventually get discussions instead of the new forums, but the larger wikis are expected to be the last wikis to get them.