Eric did say this however this doesn't properly clarify the reason specifically. All we have is a theory and that theory is about Shaft switching Richter's psychic around and making him the lord of Castlevania. Then Richter goes on a mad quest to resurrect and fight Dracula again. And again. And again. A battle for all eternity. Whether or not this is the reason is still in conjecture. That is until IGA or Konami finally decides to get down to work for a Demon Castle Wars game.
lol Demon Castle wars, Keep Dreaming.
If It Does Release it'll most likely be a Julius Mode Game with Switchable Characters, don't believe me? go play Curse of Darkness, Castlevania 3 was described as a War.
I wish this stupid game would come out so IGA would stop going out of his way to mention it in games that have nothing to do with it. (CoD, PoR, OoE, and DoS Technically counts)