Perhaps the OP could instead have a way to mark nodes as unsolved. A checkbox on the edit page to flag as 'Unsolved' and an 'Unsolved Nodes' option in Super Search. It would encourage the resolution of long standing problems. Not going to make an overworked db any happier though. :-)
Yeah... that might work, and have it automatically unset after each new posting maybe... or just be really obnoxious if it hasn't been unset... make them respond as to whether the flag can be removed after each post. That would keep people from forgetting to unset.