I have significantly decreased my participation on LW discussions recently, partly for reasons unrelated to whatever is going on here, but I have few issues with the present state of this site and perhaps they are relevant:
If you are afraid that LW could devolve into a dogmatic narrow community without enough contrarians to maintain high level of epistemic hygiene, don't try to spawn new contrarians by methods of social engineering. Instead try to encourage debates on diverse set of topics, mainly those which haven't been addressed by 246 LW articles already. If there is no consensus, people will disagree naturally.
I'm not trying to spawn new contrarians for the sake of having more contrarians, nor want to encourage debate for the sake of having more disagreements. What I care about is (me personally as well as this community as a whole) having correct beliefs on the topics that I think are most important, namely the core rationality and Singularity-related topics, and I think having more contrarians who disagree about these core topics would help with that. Your suggestion doesn't seem to help with my goals, or at least it's not obvious to me how it would.
(BTW, I no...
I'm worried that LW doesn't have enough good contrarians and skeptics, people who disagree with us or like to find fault in every idea they see, but do so in a way that is often right and can change our minds when they are. I fear that when contrarians/skeptics join us but aren't "good enough", we tend to drive them away instead of improving them.
For example, I know a couple of people who occasionally had interesting ideas that were contrary to the local LW consensus, but were (or appeared to be) too confident in their ideas, both good and bad. Both people ended up being repeatedly downvoted and left our community a few months after they arrived. This must have happened more often than I have noticed (partly evidenced by the large number of comments/posts now marked as written by [deleted], sometimes with whole threads written entirely by deleted accounts). I feel that this is a waste that we should try to prevent (or at least think about how we might). So here are some ideas: