There's an Area 51 proposal to get a vi/Vim Stack Exchange site going. The way this works is enough people have to commit to use it. Right now it's 45% complete with 91 people who are committed.
I read a discussion about whether Vim questions belong elsewhere, but due to the volume of Vim questions across Stack Overflow I think it's a reasonable proposal.
People already find a huge wealth of Vim advice on Stack Overflow -- I still find discussions about the "you don't grok vi" post, so a more vi/Vim focused community would be very interesting.