User blog comment:Cristina7/Introducing Discussions, a New Platform For Engaging Your Community/@comment-27027715-20161115162740/@comment-24258073-20161115181711

@ 146.198.29.151 - She can't. She'll have to make to with discussions, unless she wants to switch to the old forums. But at the present time, the forums cannot be switched.

I'm sorry but Wikia has pointed out that those are the only choices when discussions take over. Discussions will be the new replacement of the new forums, so in Wikia's eyes, it makes no sense to keep them both.