Surely the more profitable solution then is to invest in differentiating the parks, not making the short-sighted decision to shutter one?
I also question whether there’s a data to suggest that parks that are relatively close in proximity truly cannibalize a significant proportion of each other’s audience. With the exception of SFDK and CGA, there aren’t really any parks that share the same exact population centers (and the SFDK-CGA situation will naturally resolve itself with CGA’s unrelated closure).
The next closest pairing is probably KD and SFA, but if you take them as an example, the argument of cannibalization unravels quickly. SFA uniquely serves the Baltimore/greater Maryland area, while only KD serves Richmond and southern/western Virginia. The idea that closing one of these parks would cause most of these guests to just switch to the other park is absurd. They will either go to a closer competitor (e.g. BGW) or they will just not go to a park anymore. Hardly anyone is driving 3+ hours to a park when they used to drive 30 minutes to get to one.