In this question, it was asked whether we had too many SC2 questions. The consensus was, of course, that the amount of SC2 questions was fine, and the problem was a lack of other games.
However, I didn't realise how bad the problem was until tzenes posted this graph:
So, why is our growth comparatively low? Just looking at the relative size and enthusiasm of gamers vs sysadmins, we should be leaving Server Fault in the dust.
I think, the problem is that we are currently too narrow. We have tons of questions, and good answers, on Starcraft 2, and Dwarf Fortress.
But this is like a Stack Overflow composed entirely of C# and C++ programmers. What about the Ruby users? The PHP coders? Etc.
The reason it was so easy to attract the SC2 and DF users was because they had nowhere they had to get answers. SC2, being a new game, had no established communities (other than the SC1 sites), and while DF had a community on the official forums, it wasn't a good place to get answers.
But, for other games, there are established communities, like the ones I linked to. So, how do we attract these people here? The sites they are at aren't cape wearing supervillains, so even if they hear of this site, they're likely to just go "meh" and move on.