It wasn't always that Food and Merch were the breadwinners. This exact scenario that the parks have been working with for the last couple decades, andin this scenario, you devalue attractions for having more food festivals and merchandise events. Fill the park with cheap admissions and make it up in overpriced food and popcorn buckets.
It works and it works really really well. You can run the place as a mall with rides for a long time, but can you really run it that way forever?
And once you hit your peak of 20 million guests per year buying cupcakes and magicbands, then what? Where do you go from there?