From a business perspective, there is no reason for Disney to NOT raise prices. Supply/demand and all. They don't need a pricen incentive to get people in the door.
Though because of increased ticket prices, they may see consumer cutbacks on their more lucrative profit centers - food, merchandise, hotels. I mean . .if prices continue to go higher, I'll still go, but I definitely will maybe cut a day from my vacation, skip a TS meal, stay offsite, etc.
Once the "base" ticket prices are set, then they can adjust prices on other things to "look" good just using sales and promotions on hotels, merchandise, food or events and such. (The Kohls department store mentality).