I'd be concerned about posts like "the rational rationalist's guide" being moved to main. It's an amusing post, but I really don't think it meets the standards I would want for the main blog. And it is quite highly upvoted. I think this shows that just going by upvotes may be insufficient.
I'm not particularly attached to that metric, it was mostly just an example of "here's a probably-cheap hack which could help remedy the problem". On the other hand, I'm not convinced that one post means that a "Automatically promote after a score of 10" policy wouldn't improve the overall state of affairs, even if that particular post is a net negative.
If it's worth saying, but not worth its own post, even in Discussion, it goes here.