At this moment, it's true that there have been no instances of "superspreader" events that took place outdoors, and thus far no specific reports of anyone contracting COVID-19 at a theme park. That should certainly give people some confidence to visit the parks.
But the country's approach to contact tracing means we have nowhere near enough information to rule out the possibility that someone infected another person at a theme park, and while outdoor transmission is less likely it's still possible, in particular with asymptomatic, younger people who are often identified as the worst at social distancing and mask wearing in lines and other areas. The more people you let into the park, the higher the risk becomes of these systems breaking down, and all it takes is one asymptomatic spreader to create a potential disaster both for public health and the park's image.
Right now, BGW is comfortable with honestly pretty minimal enforcement, but with a small enough group of people that distancing is fairly easy, and with compliance levels that seem better than parks in other states due to Virginia's longer period with a mask mandate. But they will become less comfortable if higher numbers increase those "risk moments," both in terms of hits to their reputation and a potential for the state to limit their ability to open at all. I know they want more capacity, but they need to approach this gradually for the sake of managing the precarity of operations, and the balance of expansion/enforcement that will be an issue until there's a vaccine.
