I feel like post limits per day wouldn't be the worst idea. Like, if you know you can just bike-shed for hours with posters who have pissed you off for whatever stupid rationale, you might continually stir shit up until ultimately you've derailed the thread, gotten someone banned, or in fact been banned yourself.
If you had, like, 5 posts per day of allowance, would you waste it all on some asshole? Sure, maybe some people would, but by and large I think people would choose to disengage and spend their time talking with people they do like. When you can actually *value* the conversation you're having, you'll definitely feel the pull on that post allowance, but it will almost certainly force you to post better and more importantly be better.
If you had, like, 5 posts per day of allowance, would you waste it all on some asshole? Sure, maybe some people would, but by and large I think people would choose to disengage and spend their time talking with people they do like. When you can actually *value* the conversation you're having, you'll definitely feel the pull on that post allowance, but it will almost certainly force you to post better and more importantly be better.