I always think it is funny when people complain that a neighboring property is doing a normal thing. Like there was a residential building whose residents were trying to stop a gas station from being built in front. Some of them were saying they considered the undeveloped land a nature park, and how wrong it is to take that away from them. But the land was always owned by someone else and was zoned commercial before the residential building was even built. Or when the person who lives across the street from the water tries to stop the property on the water from building because it blocks their view (it is not THEIR view, it is the person ON the waters view they let use for a few years lol).
This also goes for people that moved in next to a themepark and complain about things like the lights, traffic, etc. Anything that was obviously going to happen living next to a themepark. But having fireworks every night on the very edge of their property, with no buffering from the neighborhood across the street, is a different story. As was pointed out Universal bought the land where they did, that doesn't automatically make the land around it worthless.
I think IoA is best suited for a firework show anyways. They can have a show in the waterpark that projects light on the volcano, and they could probably have some smaller pyro effects (nothing grand enough to make the whole show). And then put in a better nighttime stunt show at USF.