Yes, it does seem the idea did fall into oblivion. Mainly because it is relatively tricky IMO.
Though the two forums would likely be better with the traffic consolidated to one or the other.
The warclub forums provides 'play by forum' support, which source forge (SF) does not. So we'd have to figure out whether it's okay to drop that and let A&A.org be the only forum that supports PBF, or do we try to find another way to support PBF without warclub PHP code (which we have to host and run, so it is quite expensive from that perspective).
With two forums we have redundancy. The warclub forum gives us additional features which the SF forum does not. Consolidating first to war club could make sense. That would mean one forum in tripleawarclub.org.
I have a suggestion for the new forum. It seems like Discourse is the latest and greatest forum software for open-source projects. Now, it is open-source, but it runs on Ruby on Rails, so it would have to go on our Linux server (assuming Rails and Docker can be installed on it). I am pseudo-familiar with Rails, though not so much Docker, but could probably help set it up. I don't know if this is a possibility, but I'd say the best-case scenario. A potential forum url could be discuss.triplea-game.org or talk.triplea-game.org, or anything we wanted.
Now, if we can't get Discourse, we could go for the suggestion @aaalafayette had, Disqus. This would have ads and be less useful, but would work.