Well, I don't see any point being on system, especially if there's no way to validate if an answer is right or wrong. You could argue it may help others, but in my experience, it usually ends up with I-haz-this-too "answers", which are pointless.
I'd probably Flag/Vote To Close as off-topic with custom off-topic message being
Can no longer verify answers
I tend to go through old too localized/abandoned questions with no solutions and very low views & delete them as part of regular pruning exercise, this would probably get wiped as part of that.
So, yes it would make sense to delete the question, or at least VTC/Flag it for deletion