"Cool! Let's use our walled garden solution: KSS!"
Seriously... SO works really well for QA. Let' forget all of the fancy point/badges system: it works.
- you find just answers... no discussions, no flames, no too technical internal discussions.
- you can answer your own question (something I really like)
- you can see (and upvote) lot of useful comments, that sometimes guides you to side answers of tricks.
So in my opinion this is another wrong choice this community is doing.
On the other hand if you nobody looks at it (I really don't understand why... subscribing to a tag for receiving email like we are doing there it's easy and with low frequency), it can give the wrong feeling that there's not support.
From my personal point of view: I don't care. To be honest I'm still replying to some discussions on SO just because I always forget to disable notifications (let's do it now) and because for me Plone is more or less as the first love but I'm not an active Plone developer anymore.
But you are right, apart few of us (BTW: we all deserve @maethu a beer for the high level of answers he drop there, a couple of time he saved my ass too) nobody maintain that channel.
My only concern: are you able to stop other people to drop questions there? There's a way to permanently disable a tag? I hope so.
Final disclaimer: I like this forum, don't misinterpret me; I think we gained a lot by dropping all of the different mailing lists we had in the past and grouping discussion here.