I agree that it seems the world has gone far too vamp-crazy. I don't watch the "vampire" shows that I love (and I do mean love; I consider BtVS my favorite TV show ever) because of the vampires. I watch DS not because Barnabas is a vampire, but because he is but one of a large cast of compelling, (mostly) well-written characters. The same with Buffy; I watch these shows for their quality of writing. I have read a lot of vampire fiction (and yes, Twilight, at least in my opinion, is as bad as that editor says; in fact, some of my attempts to get people interested in Buffy have failed because they adore Twilight so much and are unwilling to try anything else. I have a couple of other vampire fiction nitpicks that I won't mention because I know that one of them was quite popular on here), and nothing has been able to draw me in like Buffy and DS. I've read the first two Anne Rice books, as well; they're very good books, but not really my thing (of course, it's been a couple years since I read them, so a re-reading may be in order; I've started looking at fiction very differently in those two years).
What I'm trying to reach here is that I do think that a lot of people will go crazy for any vampire story, regardless of whether it's good or not. But the editor is quite right in pointing out that there is good fiction dealing with vampires available.