2 weeks seems unnecessarily extreme to me though, even 24h would probably be enough to severely limit the flame potential. It would also potentially mean that one could have a daily routine of checking for the new content and replies and writing your own stuff and you're good to go for the day.
Although to really be effective I think it'd have to work on a global tick (i.e., all new content is published once a day at a certain time). Otherwise the new content would still slowly drip continuously and you'd still have the addictive nature of social networks.
At this point I'm sort of reinventing a collaborative version of a newspaper.