Since I spend the majority of my time on en.wikipedia, I didn't see the product of your work until today. Your bot notified me of a picture that was nominated for deletion. You proved what I have said for a long time SHOULD exist, can and does exits.
I will urge expansion of this technology. Templates and categories are constantly being nominated for deletion in the darkness of a rarely traveled back section. Your bot can shed light on that secrecy by notifying the talk page of each effected transclusion of the vulnerable category or template. It may not make those areas popular, but at least interested parties will have a little better chance to comment before rather than after the consensus of one or two is achieved. ~~~~