I think Goyer and Johns should have said no to a series and instead developed their original idea for Blade III as a mini-series, then sold it to Sci-Fi.
The story takes place in a future which has seen the vampire houses take over the planet. Humanity now exists as a food supply, with pockets of resistance fighting the good fight when they can.
This is not distant future, I'd say, more like thirty or so years. The vampire leaders have a trophy in their HQ: the skeletal remains of the Daywalker. A resistance cell breaks into the compound, steals the skeleton, and brings Blade back from the dead. He then leads the resistance against the supreme ruler of the vampires, Dracula himself.
The studio scrapped this idea for the usual Hollywood asinine reasons. Anyway, Goyer and Johns could have developed this idea, and then spent a lot of time looking for the perfect person to play Blade.
If the mini turned out to be a hit, it could have become a hit, a la BSG.
Sadly, this show will probably get "ashed" itself by the end of the summer, and Blade will disappear from the screen.