This show is too good to pass on, and its fans are too vocal to ignore. We will be everywhere today and everyday, until "someone" comes to their senses and makes this show happen for another season.
The show has amazing writing and the creative minds behind it, well I envy their talent and imagination! The performers are the best, and they seem to have an uncommon on-screen rapport; like they have known these characters before. Maybe they all really are old souls!
My husband first got me interested in this show and my teenage kids watch with us. The demographic is wider than you think because the story is so much more than a vampire and a cop and a beautiful P.I. The story with the characters is intertwined beautifully and it is an unimpeachable approach; the characters are nothing without each other. And after all that, there is the fantasy/supernatural aspect to the story that allows viewers the escape that entertainment is supposed to offer: if you are going to suspend disbelief you may as well really suspend disbelief!
Your (proposed) agenda: 
1) give the show a chance
2) give it a good, solid, consistent time slot
3) promote, promote, promote
4) sit back and watch the ratings roll in with your ever expanding audience and audience demographic. 