In those last few scenarios, procmail itself doesn't have to disappear in any real sense; rather users will just slowly atrophy and move to competing solutions that don't require jumping through hoops to maintain a robust filtering system. When it's too big of a pain, people would just be using something else. Natural selection.
The procmail users periodically discuss resuming maintainership, but so far no one has. I guess we conclude from that that the pain-point hasn't been reached. But it might still someday.
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