To me, Dave Cox seems like a overall decent guy who was handed the reigns of a big project with big expectations, got his mind set on a direction, and went with it. I think he did care a bit about what the fans thought (otherwise he wouldn't have responded or even visited fan forums like this one), but perhaps he either had his mind up about what was being argued about and wasn't about to change it, or the Konami heads said "Yeah, don't listen to them. Go with what we told you."
Again, I think a solid way of getting the attention of the bigwigs at the top of Konami, beyond trying to keep in contact with Cox, is to spread the word to other big gamer venues that get alot of video gamer traffic. Kotaku, Joystiq, Destructoid, even GiantBomb and Rely on Horror. Start with shooting the tin cans on the fence before you go aiming at the fortress with a bazooka.