For me, personally, it feels like a Castlevania game hasn't come out in, like, 5000 years. The last one for me was Order of Ecclesia, too, which was... what... 2008? I've virtually lost all interest in the series beyond revisiting titles I like every so often. The MercurySteam games seem like something else entirely, so it's as if the series I loved has been dormant since forever ago. It's gotten to the point where I'm quite apathetic and often don't think about Castlevania beyond the stray thought here and there (like now). When I do think about it, it's just a fond nostalgic memory of the past, but for the present... I don't care. If Konami released a notice that they would stop making Castlevania games, I would think it was interesting and a touch sad for a moment, but then I'd quickly continue as if nothing happened. If that same thing happened... 8 years ago (goddamn that's a long time, I'm surprised I'm still young and in my 20s), I would be devastated. Konami would have to completely reignite my interest in the future of Castlevania, because as it is now, I really don't care.
*shrug* I don't know. Maybe the series just doesn't work that well for modern mainstream gaming sensibilities. You never want to say something like that, and you know it really isn't true, but the sad thing is that Castlevania has yet to really prove itself for today's market. It's just had such a long history of miss steps, which predate the MercurySteam games, really. Those were just the worst of the worst, but I'd say that, quality-wise, it started really going downhill in the DS/PS2 era, and people started getting tired of the same old, copy pasted, careless thing. Order of Ecclesia was just an unusual diamond in the rough. At least from my perspective.
But yeah, the truth is, it's a great concept that really hasn't been able to find really solid footing since about Aria of Sorrow, I'd say, which was years and years and years ago.