Name that Book

[bluegargantua]

Hi,

I'm thinking of a book. It's either a novel, or an anthology title. Or it may be that there was a novel that inspired an anthology title edited by the guy who wrote the novel.

It's a fantasy title.

The main theme is that magic dies out/goes away and the wizards et. al. are left to fend for themselves. (in the anthology, it's a whole raft of stories on this theme)

Anyone? Anyone? Beuller? Beuller?

Thanks
Tom

[EDIT: Answer: The Magic Goes Away by Niven]