The numbers are connected functions of each other and nothing is designed for peak hourly capacity. Annual visitation is a number that is available that can illustrate the scale. Disney advertised the 10 million guests capacity design in the 70s and the TEA/AECOM Theme Index provides current estimates. Disney hasn’t doubled the number of days or hours per day the park is open, so more annual visitors has to mean more visitors per hour.
Annual visitation is also how you determine your Design Day and from there you determine your Design Hour. Both Design Day and Design Hour should be below, not equal to, their respective peaks. They should also be above the Average Day and Average Hour because visitation and demand are not evenly distributed. Even within the Design Day, a restaurant’s Design Hour is lower than the peak hour of the Design Day. The peak hour of the Design Day is typically the lunch hour as parks are generally busiest in the middle of their operating day, service can catch up and dinner demand can be spread over a longer period of time.
Even if you only want to look at hourly capacity, quick service restaurants have the greatest hourly capacity. Their higher instantaneous capacity and faster turn over means they will typically have 2x - 3x the hourly capacity of a table service restaurant with the same dining area. You can just walk through the Tomorrowland Terrace and see that nothing of that size has been built as a replacement.