I’m doubtful that creating a lemmy community would funnel people to the forum. There is a lot to like about the forum format over time-based ones like lemmy. And the lemmy software is much newer and more incomplete/deficient than Xenforo. I think creating a lemmy community might just lead to fracturing of content/discussions, which would be detrimental. Also, unless you host your own instance it’s not super reliable (as we’ve seen with reddit and other reddit-alternatives).