You all know these proposal are all over 1 year old and have below 50% commitment, so it will take long time (months, some likely additional year) before they start BETA.
So why not make a concerted action to bring one site to BETA which will bring alot experts to SE network commiting to smaller more specialised topics like biological evolution? You can save probably alot of time and will yield much more experts and therefore quality in your proposal. (I already wrote about quality problems sites like philosophy.SE have, as mainly hobby interested prof. programmer commited to it, but no students of this topic)
If we dont attract some natural scientists without strong programming background (which is in chemistry biology VERY often the case) i doubt alot students, graduates, phds in this branches will register on those SE sites. But this established the quality of SO, physics.SE, CSTheory.SE
So currently biology has the highest commitment and alot of questions of above proposals would fit into it: evolution, brain development, biochemistry. You can easily fulfill your commitment in such a wide topic and commit again to your favored sub-proposal. There are already alot biological questions on skeptics.SE. and we have a strong physics community here. So to me biology seems the perfect second knot after physics to establish a natural sciences network on SE besides the high quality programming network.
Of course every one wants his proposal as fast as possible turning into BETA. But think about what will be more productive for your site in a long term view. Strong Biology and Chemistry.SE sites will attract so much expters that you can easily start proposals in above subfields as CSTheory or theoreticalphysics.SE have shown.
If you think my suggestion is counterproductive plz make a comment. imho we all would benefit from this and i doubt it will cost any of above proposals more time to start BETA. We all need a small portion of commiters in above proposals uncommit and commit to biology.SE. There has to be some potential, as you can only commit to 3 proposals at the same time.
Proposal: Cognitive Science
Proposal: Biological Evolution