Magic band scans just tell them how many people are in the parks. Booking data gives them an idea of on property guests but doesn’t predict number off off site guests, locals, etc may attend on any given day.
Neither does anything to limit capacity so that the parks aren’t over crowded. The only thing they could do is just set a capacity and then turn people away if they reach capacity and that wouldn’t go over very well at all.
A reservation system gives them better control to spread guests more evenly among the four theme parks.
It seems like yes, on one hand the reservation system gives them better control to spread out guests among the parks. But it could still produce negative press pretty easily, especially while park capacities are lowered, if people consistently have a hard time booking the parks they want (i.e., MK). I can see it now: Threads and FB posts filled with "I have a 7 day trip and could only get MK one day!" The other parks (AK, HS) will be the "consolation prizes."
How do they spread out crowds? By:
- telling people, "X park(s) is/are at capacity, you CAN'T get a reservation for it";
- saying each park is X% full for a specific day, thereby incentivizing guests to choose a park with lower crowds (I don't think they'd ever give us this information);
- using some other form of incentivization to get guests to book lesser-crowded parks, particularly if guests have no company-provided information on crowd levels. I don't think they'll lower ticket prices if a park has low crowds, especially on a day-by-day basis. I guess they could significantly raise ticket prices for MK, but again, bad press (and it doesn't do anything to stop an AP from going to MK). I can't think of a way to spread out crowds other than to make each park more attractive with its offerings, and really they have been doing that to some extent (TS and SWGE lands at HS, new rides and refurbs at EPCOT,... Obviously they could do more in terms of bringing back parades, live entertainment, doing refurbs, building more pavilions and rides, etc, but that's probably not happening anytime soon).
Therefore, *if* they plan to use the reservation system outside this period of significantly-reduced park capacities, is the reservation system really about controlling crowds, or it is about allowing the company to more tightly control staffing? Even then, they've been open almost 50 years and should have plenty of data on crowds to be able to predict demand on any given day.
Note: I think turning away people at the gates AND people not being able to get reservations for a particular park would both not go over well. But maybe the company doesn't care? There are plenty of people pretty upset right now over the lack of information, and people seem to overwhelmingly be of the opinion that Disney wants them to cancel trips.