This isn't an answer per se just a thought.
I believe we need to determine where
TeX related discussion question that have no right answer belong since we have many good post that fit this description. These question incite thought and a lot of participation from the community.
As Joseph Wright said in his post, that discussion is in chat, but from my viewing of what happens in chat, that is more banter with
TeX, jokes, etc throwing in mix. When a discussion post is truly
TeX related and useful to the community, I think it deserves to be on either meta or main site. However, some of these discussion questions are okay for the main while others are migrated to meta even though none of the questions fit the mold for meta or the main site.
The only question we should have to answer is where do useful thought provoking, unanswerable, discussion type post belong?
I think there is one problem with dedicated chat rooms. Only the avid users will be checking in on those rooms. With many of the great discussion post, we will have brand new users come propose great answers to these discussions with that being their first post. I think that would lost if the site decides to dedicate chat for those type of posts.
Obviously I believe site related discussions belong on meta no matter what the outcome of this thread.
From the recent posting on meta, I think we (as a community) need to determine where discussion questions belong ignoring the issue isn't the answer.
These recent questions were all spawned because of the discussion in the comments about closing, moving, or making Are there any open research problems in the world of TeX? a community wiki. I casted the first close vote to move the thread to meta because my question A LaTeX competition to promote LaTeX to the masses which wasn't about the site was moved to meta. So my reason was it was a discussion question, no answer, but still
TeX related so it was moved.
When will we seriously consider determining a location for these types of questions to avoid all this noise in the future? If we make judgement calls per post, each person who doesn't like the decision can post these repeat type of questions since they will all be about a different post and thus not a duplicate because the previous post in question were in relation to a different thread.