Blade was modestly successful, or so I remember; successful enough to encourage Fox to put the X-Men movie into production.
And as for vampire craze, Twilight absolutely kick started it. Buffy wasn't really popular besides its devoted fanbase, Blade performed decently (as mentioned above), and from what I've read, the True Blood book series (Sookie Stackhouse Mysteries? The actual name evades me) was successful enough to warrant multiple sequels. Although I don't remember any of it, I'm pretty sure that Anne Rice's vampire stories were pretty popular as well; popular enough to get a movie with Tom Cruise, anyway. None of them, however, captured the public's attention like Twilight.
You don't remember this? It was a mini cultural phenomenon - everything vampire was suddenly in. Millions upon millions of fans, mostly preteen to teenage girls, devoured Meyer's "novels", vampires were all anybody talked about in terms of literature, and anything relating to vampires filled store shelves/movie and tv screens to capitalize on their sudden surge of popularity.
Please note, I'm not saying this because I like the series or anything; I detest it with the staunchest of the haters. Unfortunately, those are the facts. Luckily, it seems to be fading, and soon the next cultural fixation will take hold for a few years.