When will enough be enough!? Ticket prices are an annual thing...sometimes 2 times a year! When will it be too much to even "think" about going to a Disney park!?
For Disney Broadway shows, the pricing for a seat is constantly in flux. As a particular section of a particular show starts selling out, the price for sitting in that section rises. As a particular show in total is starting to sell out, the remaining tickets jump in price. They're worth more because of lack of supply but continuing demand.
The time will come, I predict, when the prices for day-tickets will float in the same way. If the first week of October, for example, starts to have a very large amount of sales (due to several conventions, e.g.) then the price of tickets for that week will start to rise. Wouldn't be surprised if resort room costs also started to float. (Of course, the opposite would happen that in very low attendance weeks, the costs go down... which is sort of what Disney does anyway with pop-up discount offers.)