I'm sure you've read on other blogs that publishers are sick of vampires. I feel this point needs to be clarified a bit.
First, based on a quick search on Bookscan and a perusal of the aisles at my local B&N, the reading public certainly isn't sick of vampire books. As long as they are marketable, publishers will continue to publish them.
Second, I think most editors (and agents) misspeak when they say they don't want to get vampire submissions. I think what they really mean is that they don't want to get unoriginal and often poorly written vampire submissions.