User blog comment:Cristina7/Introducing Discussions, a New Platform For Engaging Your Community/@comment-5028213-20160908204553/@comment-5275700-20160908230024

I think you're asking -- if a community has never used Special:Forum, will they get Discussions automatically?

The answer is no, but such communities are certainly encouraged to enable Discussions, now or in the future. Nukapedia, Wookieepedia, Final Fantasy Wiki and others with Discussions never used Special:Forum. But they have found success in expanding their communities and engaging with the new users that Discussions can bring.