Now before I make the suggestion, I know this would be quite difficult to police but bare with me, someone else may also have a suggestion
I've noticed that quite a few gallery showcase threads go unanswered or have 1 or 2 responses, yet have 50 views or so.
Now theres nothing wrong with viewing at all! I do it, you all do etc! But at the same time everyone likes posting work and getting reponses.
An idea might be: For every thread you post in there, could you please critic 2 other peoples work.
It might bring a bit more activity back rather than just lots of empty threads.
Anway, i know the logisitics are tricky, and it would rely on goodwill of members.