I think no matter where the game is set, there can always be wacky landmarks with questionable histories to fill with monsters. Winchester Mansion, anyone?
Dawn of Sorrow felt kind of empty plot-wise, and the idea of a high schooler being Dracula's reincarnation is still kind of dumb, but the post-Dracula setting has some promise still. Why not expand upon the cult? Why not make them an actual cult that does actual cult things, like kidnapping, brainwashing, and ritualistic sacrifice?
Also I want to see Soma being as old as Julius, possibly with a goatee.