I think a CV movie would hurt more than help the series. Movie makers have always dropped the ball with videogame to movie adaptions (except maybe Onechanbara, with minor modifications aside, is probably the only movie that's pretty accurate to the videogames. With MK1 movie being maybe 2nd or 3rd. ).
FF7's movie was just eye candy with a really slow and boring story for the most part, with washed out heroes that only possess a drop of what they were in the FFVII videogame. And the Sephiroth clones/whatever are some of Nomura's most uncreative and tasteless designs.
if people want a Castlevania movie, I think Vampire Hunter D is as good as Castlevania-type movies can get. And Val Helsing wasn't too bad if you like a mix of vampire hunting and humor.