Special Icon for Old Threads
So here's my new idea:
Create an icon (similar to: , or , but perhaps with a different color) that is automatically assigned to threads that are either (a) above a certain age or (b) have (or have had) a significant gap between posts. People could still post to them if they wanted to, but at least it would be obvious that the OP is probably no longer interested in the topic so any current discussion is likely just a vehicle for signature masturbation by people who don't know anything about driving traffic the right way.
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Lightin' fuses is for blowin' stuff togethah.
"Opportunity is missed by most people because it is dressed in overalls and looks like work." Thomas Edison