So, what of all these thing should we really work towards together?
Why not all? We are a large community, this is something we can easily tackle together.
The amount of low quality posts is 19,726 and rising.
A huge number of low quality posts like this is difficult to salvage. These all easily go back over two years, and a lot of these questions are probably ignored by now. We can't fix all of those, but we can start somewhere.
Rather than trying to look at 19k posts, why don't we put more emphasis on Reviewing more new posts, and those who have a more vested interest can go back a week/month/year and edit as they wish.
20% of the questions are unanswered, there are a lot of questions no
longer being followed up.
The largest issue I see with this is users who post a question, then never get back to it, or just don't know how to accept it. The question MIGHT have been answered, but it's simply not marked because the user hasn't returned. There really isn't much we can do to this, as the users are gone. Unless there is a tool for moderators/administrators to mark the highest upvoted or something as correct, then this number likely won't change a lot.
The blog is getting less attention these days, we've got our views now
but could lose them again.
We had a lot of posts for a while, but our writers burned out a bit. There are hopes that the competition right now will attract more bloggers. I think we should maybe add some more segments, such as the old "WTFriday" and interviews, etc. Drop by the Blog Editor room to shoot any ideas to the great people working so hard on maintaining it - Ivo Flipse, nhinkle, and KronoS deserve massive props for all the work they do to get us going.
There are still quite some questions that don't represent the site
anymore, and I'm not only referring to the highest voted ones. Our
delete votes don't keep up with that and the activity in the vote to
close / delete chat room is quite low. We started cleaning but it
isn't helping us much further.
I'm sure moderators will happily accept your flags for these items. I have been flagging many old shopping questions that got bumped lately, and they have all been deemed "helpful" by the moderators, and subsequently locked/deleted. Perhaps you should speak to moderators before flagging though.
This is my thoughts on the issue, and my ideas are starting to resolve it. Overall though, the only way to accomplish anything is by working together as a community, and getting the word around, let it be chat, meta, or the blog. We can fix this.