Proposal: Drupal Answers
I've heard rumors that "project specific proposals are no longer accepted." Is that why we're stuck at 99%? Did the WordPress peeps pay someone off? Inquiring minds want to know! ;)
It looks like commitment percentage is much more complicated than you might expect! I remember working out that, when we were on about 250, we'd get to 100% with 300 users. That calculation was far too naive! :-)
We're at 100% now, yay.
Anyways if you want to know about how the commitment procentage is calculated, checkout this post. It might have changed, but the general idea is probably the same.
Getting a beta site is a good start, and will probably move some traffic away from the SO drupal tag. One thing we need to keep in mind, is that a good beta site might not be enough to get the site launched. Take Geographic Information Systems which is looking good and have been in beta for over 200 days. Only 90 days is required.
If we want this site, we need to put some effort into the beta site when it's launched, to show that we have a lot of Drupal experts that are willing to answer tough questions.
Looking at this, it's likely that the problem is there's too few people with a reputation of over 200, for example mine here is only 151 despite being active on Serverfault