if Demand is higher than Supply, you raise the prices to decrease the quantity demanded, which in turn will sell less tickets but increase profits by reducing overall operating labor costs. In turn, making it more enjoyable for those who have more expendable income to utilize for recreation.
What Disney did was lower Park Capacity (supply) for HS and MK and decreased the number of trains/vehicles per hour on popular rides at all parks(Space, Thunder Mountain, Splash, Mine train, Slinky, Aerosmith, Everest, Tower, Test, Frozen,) this was done to make lines longer and entice lighting lane purchases.
Prices will not go down when Mario land opens but perks will for the middle and lower class Americans at Moderate and Value resorts that will initially opt out of disney for their family vacations and go to Universal, they will be lured back by offering perks such as extra magic hours and perhaps advanced lighting lane purchasing and reservations a few days before that 7am window.