So what if the park doesn't do well as a family park? What happens if Universal sells it? Or if they turn it into a thrill park or year round HHN? The CURRENT plan is fine, but there's no telling what may happen down the road.
The neighbors will always think the worst no matter how many assurances they get. And neighbors who move into an area after a park was already built spend a lot of time, money, and energy fighting the park even though the park was there first.
I'm not saying any of this will happen, but I also understand why neighbors have trepidation.