Not so much he's god, but his departure signals the end of an era for Castlevania and Konami.
LoS2 apparently bombed, and Konami probably won't revisit the IP for awhile until they find a new studio/direction for the series. Who knows how long that will take, but we all knew at the end of the day Konami never had plans to return to what we all love about Castlevania in the first place; the 2D games.
If that doesn't bother you then more power to you, but I'm not liking the idea of the series reinventing itself over and over again to the point we get something way more different than LoS, and LoS didn't have much to do with the series until the dev team listened to criticism with the sequels.
This industry has taught me it pays to be more pessimistic than optimistic these days.
IMO, IGA didn't create Castlevania, and his departure sure as well won't kill it, but with your logic, it was dead long before IGA left.
Count me as someone who never thought IGA was coming back. He was on the Castlevania "project", so to speak, for 13 years. You don't just take a series out of someone's hands after 13 years only to give it back 4 years later. Whatever was going on behind the scenes, Konami no longer saw IGA as a profitable investment. That doesn't just change because the new idea "flops", and I use the quotation marks because we don't really know if it is a flop quite yet. We have 55k sales in 4 days for the physical PS3 copies. That's it.
Anyways, there is still a chance to see 2D-vania again. Is it a big chance? No not really, but it's no bigger or smaller than it was after Harmony of Depair came out. But perhaps with the current market, it's more suitable to the indie scene anyways. I'm sure whatever IGA comes out with will basically be a Metroidvania in everything but name, and will most likely itch everything IGA-fans are looking for.
Whatever he makes, I'm sure I'll end up playing it.