It’s not so much about knowing when it will be busy as it’s about knowing when that odd low crowd day is coming so they can cut staff.
They typically already do. They have crowd projection numbers and have had them for years. They have adjusted schedules based on this for year. It was based around hotel reservations dining reservations ticket sales and historic data.
I'd imagine this is probably more accurate but not drastically so that you would want to alienate your entire fan base.