I'd say this is more than likely. I think IGA's been pulled in almost any direction by now; I have my issues with his direction but I'm sure he's having a terrible time in his position, and it's not his fault.
Harry, Wizard of Oz omages aren't silly - they're classy. I'm not sure we have the same definition of "silly" (I'm not a native english speaker so in case we don't, it's probably my fault). I don't see silly as the opposite of "serious". CV never was serious, and can never be. Heck, even LoS isn't "serious" (and the Chupacabra isn't the only thing to point at). Something can be goofy and creepy at the same time, like the Flea Men. Looking at something more realistic-looking, take the Marionettes from DMC. They were absolutely goofy, but still gothic and creepy and they didn't disrupt any "serious" moment that came after it. Vacuum cleaners and the like mean that any possible "epicness" in the story is gone. The illusion of disbelief is broken - it's just a game. It's Super Mario now.
I hope I made myself clear now.
But how is fighting a tin man classy? I understand the dislike of the vacuum cleaners (I agree with that), as its just to the point of being ridiculous, and I agree that Castlevania has never been serious, but IGAs game are just as silly as many previous games in the series. They always had a contrast between things which are what you would expect from a gothic themed game, and also still had fun characters and elements. For instance, in the KCEK game CV64, was drowning in dark atmosphere, but they still had skeletons on
motorcycles. But that was fine, because in Castlevania less serious elements have always been used along side darker ones, which is one of the reasons why the series awesome. Sort of like in the original DMC, where you fight all of these monsters in a creepy castle, but Dante still has a bunch of cheesy one-liners (flock off feather face), and it still works.
What I'm trying to say is that IGA didn't really make the series any sillier than it already was. Yes, he made some really bad decisions about Dawn and Portrait, but overall he has tried to stay faithful (even if he has failed) to what the series has always been about. He just is a bad designer he keeps using clashing art styles and poor gimmicks with no intent on progressing, but he has always maintained that feeling of what is Castlevania. Even Portrait and Dawn, with their terrible stories and art, were able to maintain that feeling at times, even if the suspension of disbelief was broken at times (well, a lot of times), but that vast majority of IGAs work has been able to maintain that feeling.
Castlevania has never been about maintaining "epicness", it has always drawn many elements together, whether there cheesy or not, and making them work along side each other. A little anime style girl defeating the forces of darkness isn't any sillier than a barbarian eating meat he finds inside the walls of a castle. I disagree with you on Lords, I think they were trying to be serious. For instance, Cox and Mercury Steam seem to be too occupied with making it epic and adult (like the nudity, which was completely uncalled for), and the comical elements they had (like the chupacabra) seemed like an afterthought and weren't very endearing or charming. It was way to serious (which you said yourself, is something that Castlevania has never been), and it paid more homages to Metal Gear Solid and Portal than the series it was based on (name drops don't count). The game was just filled with grotesque, uninspired imagery and lacked any charm. The removal of some of the silly things the series originally had has made Castlevania lose a bit of its soul.