It looks like SQA site is 2266 days in public beta as of today.
How long would it stay in beta and what should happen to help it get out of beta?
The site will stay in public beta as long as it needs to. Based on our stats on Area 51 we still need more questions asked per day (preferably good questions) and we still have too many questions that haven't been answered.
We've been one of the slow-growing exchanges that's healthy enough to keep open, but not quite ready to go live ever since we passed the 90 day mark, so who knows how much longer we'll need?