I've never been able to see entertainment or educational value in stories involving the sucking of blood from the neck of a human being. Still - whatever floats yer boat! The classic Dracula was just about acceptable, as a novelty, but beyond that I'm unlikely progress within that genre.
A September 2009 article by Christopher Beam and Chris Wilson at Slate, titled The Garlic Years has an interesting timeline of the ebb and flow of vampire fads between the 1960s and 2009/10. They call the years of ebb "Garlic Years". Their research covered movies, TV and books, and threw up 4 such periods when the vampire fad faded:
1960 - 1965
1975 - 1976
1980 - 1984
It'd be intriguing if those periods corresponded with some particular astrological patterns, but so far I haven't identified anything specific to just those years. It'd be necessary to consider the age groups mainly involved in vampire fads too: late teens/twenties? Their natal years and positions of the generational planets during those times would also be significant as would be any peculiar alignments to those planets occuring during the "Garlic Years". That could get very complicated, and I'm not a complicated gal! Astrological connection to the vampire legend itself must have a very strong link to Pluto/Scorpio, the planet and sign of its domain represent all that is dark, erotic, and with links to death. That's as far as I'll go down the astro road on this.
There could well be some more mundane reasons for the Garlic Years, from the fans' point of view anyway. The presence of an alternative fad or concern, or even a lack of stress related events. I have a feeling that in stressful times, such as those we are currently experiencing, vampire tales provide something of a release valve for young people. The Twilight series, as well as True Blood and others, in TV and cinema, have provided a mega-fad during the past 2 or 3 years.
In the 1960-65 Garlic Year period the Beatles and the hippies provided alternative fad focus.
In 1975/6 the Vietnam war ended - a relief from stress in the US at least. (For the UK though the IRA were wreaking havoc in London and elsewhere.)
In 1980-84 the Reagan years in the US - a recession in the early 80s had improved by 1984. Was there an alternative fad then? The first rock video cassette appeared in April 1980 and spawned a whole new industry - and fad. By 1983 MTV had conquered the New York City and Los Angeles markets, as well as network television.
1997 - I don't even have to research this one: Princess Diana was killed in a motor accident in France, and it seemed that the whole world went mad with grief = alternative fad focus.
For whatever reasons, astrological, mundane or a mix of the two, we now find ourselves in the midst of some very non-Garlic Years!