Disney isn’t dumb. They’re not going to add a flat rate pass because they know that “customer sees higher flat rate price versus lower ala carte = not going to buy higher option.”
Here is an example and I am loathe to use it.
You walk into Dave and Busters. You see a high amount of tokens or even unlimited for x amount, versus a lower amount for x price. Even though price per token your probably getting a better value on the higher option, you see the lower option and reason it’s cheaper and you will be fine, you don’t need to play that many games. So you get lower options. Then you find those few games you’re just having fun with and want that price so you keep going to reload that card. And in the end….you’ve spent the same amount or even higher then if you had just bought the higher tier upfront.
So sure, WDW could offer an all in one all inclusive unlimited pass like cedar fair or universal for say, 175 a head. But they realize that if you’re going ala carte as you go, there will be those guests who want that second re-ride, short lines all day, and so on. And without thinking, they impulsively hit that purchase icon in Genie, and the end of the day you spent an extra 200 bucks per person without realizing the overall cost.
When people go shopping, they are subconsciously induced to buy the 2.99 box of Cocoa Puffs vs the 4.99 box. Not realizing that per ounce, the 4.99 is way better value and they didn’t really “save” money in the long run.