Some day we may have a forum (in the broadest sense) that uses a sensor, like a webcam, and "emotion recognition" AI. You are not allowed to vote if you are too worked up about a comment, and if you post it will be held for a few hours and you have to acknowledge that you still mean it after that "timeout" period before it gets published. This should/could take care of some hot-headed responses. I think digital discussion needs more ideas, just "post your comment here" and "votes" don't really cut it. It's better than nothing (pre-Internet), but we've seen the disadvantages by now, why not try something new?

Internet discussion and collaboration software could be (should be?) the most exciting thing, instead everybody just copied and barely modifies the core concept in use since the very first web forum software was first published.