I do not have enough knowledge to criticizes (do you have thread about it here in talk or in devel? Link it here) current voting system, but i know that activating people here doesn't hurt it. Also what I have observed in some OS communities is that they really need (this might sound lame) ongoing cheer up process (could not invent better description sorry ). Constantly poke users, advertise what is happening and so on. Even if it might make old users bit annoyed