Kim Newman's Anno Dracula series does the same thing. In the second book, Edgar Poe (he dropped the Allan) has been a vampire for decades, and laments the fact that he apparently hasn't written anything good since turning. And that kind of thing would be a good explanation for why vampires haven't taken over and turned humans into cattle - only humans can make living forever interesting.

Exploring how a creative person (artist, writer, musician, etc) deals with discovering that becoming immortal has robbed them of their gifts would be interesting. (Un)Fortunately, that idea probably isn't sexy enough for LKH, so she probably won't explore it.

That is, of course, assuming she even remembers that bit of world-building. Wasn't the big bad in Bloody Bones outright said to be a fairy, only for her to say years later that they don't exist in the AB-verse?