What if they did a tactical style castlevania game?
They could have some sort of storyline where Dracula is finally able to ressurect and he ends up destroying all of modern civilization. His army of darkness is hunting down all the remaining survivors but what he doesn't know is that the same power that brought him back to life also revived all of the previous Belmonts. So you get to take control of all the Belmonts in a tactical style rpg as you fight your way to Dracula's castle to finish him off for good. The enemies would be the most gruesome ever and they would be led by one of the bosses from the past games along with new bosses or other lesser vampires (all bosses would be represented.)You could have cutscenes where the characters tell about their own journey and only someone who played the game would remember it. This would allow for much more character development and perhaps allow them to straighten up their story. Bleh, just an idea.