If the name is excessively long, people will just call it what they want. Harry Potter and the Escape from Gringotts = Gringotts. Harry Potter and the Forbidden Journey = The Castle ride. The Wizarding World of Harry Potter = Harry Potter Land.
I'm betting people will end up calling this the Forbidden Forest coaster. Personally, I'm going to call it Dragon Burial Grounds, but that's just me.