The amusement park sounds like a better idea to me, other than some cult having the funding and ability to just rebuild Dracula's castle complete with eldritch architecture and all that jazz. I like it better as an amusement park that they opened a portal to hell inside of.
Also, Id prefer if the whole Dark lord thing DoS did was forgotten. That was really bad. For one, neither Dario nor Dimitri were likable at all. Dimiitri had a VERY interesting power, with his copy ability being essentially an inferior derrivative of Soma's power, but he was still pretty bad.
Also, the idea of a bunch of superhumans running around with powers because they were born when Dracula died, really cheapens the idea that when Dracula died, he didn't just explode into confetti that spread his powers around, he specifically wound up reincarnating as Soma.
it makes Soma's existence feel cheap.