When magic stops working (#SFWApro)

So a long time ago (but I can’t seem to find it searching) I wrote a post about Hugh Howey’s statement (he’s the author of the self-published hit Wool) about writing fantasy, to the effect that “If my concept was a world where magic worked, my story idea would be that it stopped working.”
I didn’t really agree with this because I don’t think “magic works” is a concept—usually it’s more like a setting. It makes as much sense as saying “If my concept was a world where science worked, my story idea would be that science stopped working.”
That said, “magic stops working” can be a good concept, as witness it’s been done several times. So in fairness, a short list of stories which use that as a premise (as opposed to using the end of magic as a finish of the story).
•Elantris by Brandon Sanderson. A city of magic and wonders decays overnight. Ten years later, it’s magic is gone and it’s become a dumping ground for accursed mutates.
•Larry Niven’s Warlock series, starting with “The Magic Goes Away.” Magic draws on a finite supply of energy. It’s being used up. Eventually “the stupid, bloody swordsmen will win after all.”
•Barbara Hambly Raven Sisters books, Sisters of the Raven and Circle of the Moon. This time it’s the men who are losing the power to work magic, and without magic the desert kingdom won’t survive. Women have magic, but is there enough?
Any more anyone can think of?
Now that I’m thinking about it, I wonder if some fantasy stories don’t count as “science stops working” tales. Take Fritz Leiber’s classic Conjure Wife, in which a college professor discovers that magic is real: the world’s women are all mages, using their magic to manipulate their men’s careers and defeat the other wives boosting the other husbands (this was back when the stay-at-home wife was the default image for womenkind). In learning that magic works, isn’t Norman learning that science doesn’t work, or at least not completely? Likewise, the mage of Black Easter, as I’ve mentioned before, specifically points out that in a world where heaven, hell and magic exist, science doesn’t actually describe the world accurately.
I think there’s more to say, but I’m not coming up with it right now.