Not without an existing community to build off of you won't. You'll fail miserably. The people in the Area51 proposals are generally meeting there for the first

Not without an existing community to build off of you won't. You'll fail miserably. The people in the Area51 proposals are generally meeting there for the first time — they didn't know each other already. MetaOptimize is building on top of an existing well-targeted community like MathOverflow did. Really, just like you did originally with your and Jeff's blog communities. AskMetafilter is successful because it was an outlet for an existing community — it wasn't attempt to start a new one. Area51 is scavenging small clumps of people that happen to overlap with your existing main sites. That your sites are so QA-focused makes it very difficult for an actual community to grow within it — there's no outlet for chat and friend-making, for fucks sake even your moderation site is the same QA format! At least you've integrated it a bit more so that Meta isn't a completely separate community with it's own account system…