there is an old post named something like "post cards you're looking for here" that did something similar to this, but I think that there are just too many sets to try and do this in one thread. Plus post eventually lock so users can't update them once trades happen.
I like the idea of each set having a thread, but I think the forums is a bad place for it, as there are far too many series to do this for. Even sold out sets would need a thread as people still trade for them. And again with posts locking, this information wouldn't be helpful over time.
The facebook group for this site did this well with the new releases, as we had a post each day, but member participation there isn't as strong as it used to be,
I think it would be nice if each set's page had some kind of discussion feature like that, but not sure how hard that would be to implement.