It is still very rare to find a discussion which is not highly technical in focus that is of a somewhat decent quality. I would love to have a good debate about, for instance, the economic, social, financial, ecosystem etc. impact of bitcoin and crypto-currencies, but very quickly every topic gets flooded with one liners, empty statements withouth any reasoning, and often not even connected in any way to the topic of the thread.
You can make these discussions in the Serious Discussion board if you're worried about sig spammers and farmers. Maybe we could experiment with an up-vote/down-vote feature on the new forum in one of those boards, but I'm not sure I would want it site-wide. I think if it was people would just abuse it with bots and down vote comments from people they just don't like.