Potter's Possibility at Universal

So, I'd like to say this. Universal Studios does Halloween REALLY, REALLY well. They know how to make a maze, and they know how to do horror and gore. Potter itself is a franchise filled with possible terrors and scares, with obvious players being death eaters, dark wizards, Fenir Greyback, giants, the spiders, dementors... the list can go on.

So why, after two years, has this combination of talents happened?