I feel this would be very poor for vibrant discussion. It would further divide conversations into very long posts as people try to ensure they get every possible thought on something they conceivably have into their one reply (which then many won't read), or snarky / completely unproductive short replies from people just wanting to show up in the thread to show up.
Threads derailing, or rehashing points, or debates circling on perhaps relatively minor aspects of some idea (this isn't pointed at the thread in question, I haven't read it yet) are just...part of having forums and discussions, there's only so much there, there as far as policing things into productivity. Civility is another thing, but it has gotten 1000% better in the last few months.
The OOC channel is a whole other beast, like Talon I try to stay far away from it. Seeing people take to it and call players out (by name) and tearing into them with sort of weird vitriol for their BGBB posts, their ideas, etc. with no repercussions was a daily occurrence just weeks ago. Presumably the OOC moderation step has helped curb things like that, I can't speak to it. Maybe if some of the civility that's finally taken hold on the forums expands to the culture there more players would hang out.