I finally played Shantae: Risky's Revenge based on Jorge's high opinion of it, and I must say, I agree that it is the strongest proof that WayForward is capable of making a fresh 2D Castlevania.  WF has had it's share of lame games and missteps, but they HAVE done right by most of the outside IPs they've picked up.  BloodRayne and Aliens are both spot-on with the source matetial, and with Contra 4, they even managed to fix some inconsistencies created by the franchise's original localization.  Again, if IGA won't reunite with Kojima and Yamane for future Metroidvanias, I would love to see WF pick up the torch.  It seems like a strong possibility anyway.
And even if Double Dragon Neon isn't perfect (and probably should have remained in hand-drawn 2D), it's hard to deny that Jake Kaufman's soundtrack and Genzoman's artwork aren't pure awesome sauce.  Kaufman could definitely adapt Yamane's tracks properly, and even if Genzoman is vastly different in style than Kojima, his designs are edgy enough to fit the CV aesthetic.
Furthermore, while I enjoy the Japanese-developed CVs the most thus far, I can see why KONAMI would allow Western studios to try their hand at Castlevania and Contra, since both series sell exponentially more units in America than anywhere else.  They always have, since the very beginning, so objectively speaking, it's a pretty sound business decision.  That doesn't mean I always have to agree with the results, of course.