You know I think the image of the forum being used in the analogy is the mythicised one, rather than something completely historically accurate.
It's not like we never have multiple threads on a subject on the fist page. How many Ask A Certain Flavour of Christian threads are we sporting at the moment? And lets not forget the double homophobia whammy recently.
To get back to this point, yes, we have multiple threads on a given general topic (e.g. homosexuality, religion, US politics), but we don't have duplicate threads on specific news items. No duplicate thread for California adding some bits of gay history into their curriculum. No duplicate thread on 50% of Texan students being suspended. If you were to start one, it would be closed. That's how it's always been. You can start a thread on the same general topic, but the majority of threads are specific rather than general (and if a rather general thread exists already, then starting another thread on the same topic will probably result in a lock as well; if you were to post a thread asking whether or not homosexuality was wrong, it would be locked if one was already active). Yes, you can have a thread about the Californian curriculum and a thread about religious views on homosexuality at the same time, for example, even though they are both about the general topic of 'homosexuality'. But you can't have a second thread on either of those more specific topics. That is how the rules currently stand. So allowing for both an RD thread and a non-RD thread on the Californian curriculum, to continue the example, would be a
change from this rule. I'm not ruling out the possibility of such a change here (I don't think we're really ruling out
any reasonable possibilities at the moment), just saying that it would be one, because currently duplicate threads are not allowed. I think you're talking about more general topics than what make up most threads.
So if we were to allow two threads on the same news item; one RD and one non-RD, how would that pan out in terms of activity? History seems to suggest that people are generally attracted to a fire. Troll threads often get very high activity. Does this mean that the worse of the two threads will be preferred, because it gives people more of an opportunity to troll, or to observe trolls, or to watch others squirm? What happens when a moderator action is posted in the RD thread to improve the quality? Wouldn't it just be easier for the poster in question to take it to the non-RD thread, rather than actually being bothered to think about what they're posting? Doesn't this create an echo chamber? And wouldn't this drag with them those that they are arguing against (because there is someone
WRONG in the other thread)? Is that an accurate representation of what people prefer? I'd be tempted to follow a conversation to the non-RD thread if it meant there was someone to actually argue against, but in reality I'd most likely prefer to be arguing against them in a situation in which they had to abide by the RD standard. But because I would've jumped ship to the non-RD thread, it gets my activity instead, and the RD thread dies. I think a lot of the time unless you've got two sides who are willing to engage in a civil and productive discussion it's a race to the bottom in terms of posting quality. If one side of the argument doesn't want to play ball and discuss an issue, then they'll move the conversation to being of a lower quality. RD threads largely work on the basis of 'if you want to discuss this issue, please abide by these standards/conventions', but if on any given topic you can instead go and not abide by those standards/conventions, can they actually be upheld?
Perhaps that's a rather pessimistic view of what would happen. How do you think two simultaneously running threads on the same news item would pan out if one were RD and one non-RD?