Developers have visions too. It's not JUST about what the audience wants, sometimes the developer wants to make their own vision on something. And despite LoS being divisive, it WAS successful, meaning that there WAS an audience for that vision.
My opinion is that a franchise shouldn't change a lot. If they want to make games with their visions, let them do a new IP or alternative games, not their games be the only games for 6 agonizing never ending years.
This was about movies' soundtracks in recent years, though.
But if when a new studio takes Castlevania the games have the same approach, and especially the same music, I guess I will stop buying, stop playing and stop caring, and like me, there are a lot of life long fans that have been alienated.
For example, I'm not buying LoS 2. I will download it from Piratebay when it comes out for PC and give it a chance, though I already know the music will be the same as in LoS 1 and MoF.
And if nothing change in the next game, I won't even download it illegally. I will just watch a few videos on YouTube and check the look and music, and that's it.
Eventually, newer fans will replace almost all CV fans, and the franchise will be a completely different thing, all for the sake of being profitable and saving the name, which, without its soul, it's just a name, just letters, nothing else.
At least Konami should have the decent of making a low budget, downloadable game of a new IP about vampires, with the spirit of Castlevania (like, music, for example), so older fans don't feel betrayed, cheated and abandoned.
I hope that the developers that lurk here see all our opinions. 
You are right Lely, as consumers, we vote with our money.
I always hope that Araujo would read everything I post.
On the other hand, I'd like the artist who designed Trevor to read how I like him, too.
Im not she, but I think that she meant that we are not obligated to accept everything that they send at us with a smile. They need to hear our feedbacks more often and adapt if necessary or otherwise people will stop being blind fans (not everyone, Im talking about these really fanatic that buy even the worst and plan to continue buying until they bankrupt, even if these games are bad) and boycott their games until they get better.
Yes, I meant that. Of course I won't be accepting anything with a smile. When the Castlevania name is there, I will be accepting just 2 things with a smile: a ClassicVania with traditional CV music or a MetroidVania with traditional CV music. Everything else is just that: something else.