It's a spiralling down to death of a forum when people simply don't post. Everyone winds up waiting for someone else to post, and when they don't see that happening, they get bored of not seeing something new and eventually just stop dropping by.
That happened to a gun forum I used to run. When only 10 or less members were stopping by each day, I figured it was a waste of my server space and I got rid of it. Even with a new owner, it never recovered and is still just barely limping along.
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