Well, let's suppose they discounted the After-4 Epcot pass by 4%---so it is $147 instead of $153. Who cares? Probably no one. I often don't even bother to order my tickets from
Undercover Tourist these days, because it's barely worth the $25 or so to remember to do it.
In other words, I'm pretty sure those next-to-nothing broker discounts are not what convinces people that, by golly, maybe they should go to WDW after all. And, it's not reasonable to expect much more. For the most part, Mickey doesn't discount the gate. Why? Because the theme parks are the biggest reason why people come. Why discount the *one* thing that draws people in? Instead, Mickey discounts the ancillary things---the hotel rooms, the food, the merchandise, etc. That stimulates additional spending on the part of people already attracted to the parks. There are some things that look like ticket discounts (kids play free, the DVC AP discount), but they always require big bucks spent on hotel packages or DVC purchases to get to them---and the Resorts side of the business is what is paying for the "discount", not the Parks side of the business.
If we see any broad-based admission discounting going forward---and I don't think we will---I'm guessing it will be in the form of seasonal discounts on admission.
Disneyland does this from time to time; they discount admission during the relatively unpopular winter months, for example, when the Southern California weather is still half-cruddy. WDW has gone the other direction---they have created extra events to increase value and stimulate demand in what used to be low-attendance periods: Food & Wine/
MNSSHP in early Fall,
MVMCP/holiday offerings late Fall, Marathon/Princess Half/ESPN in the off weeks of winter and early spring, Flower & Garden and SWW for post-spring-break, etc.