We've been trying, honestly what more can we do to expand into sc2 anyway? We have the resource set up, the dev forum set up, etc, etc. What haven't we done for sc2 yet?
It's not a matter of the site, it's a matter of the user-base - they just don't seem as interested in using the assets we have set up. Besides, as I said earlier you probably wont see many sc2 type resources until Blizz releases the art tools so modellers don't have to bend over backwards to make models for the game (models is essentially the main thing that keeps this site alive, at least for wc3 - people can quite often make their own spells and icons are okay if they're not quite perfect but very often you need a specific model or something just doesn't work right, I know when I modded wc3 a lot that was my main use for this site).