True but will they need to offer ticket discounts if the 50th Anni and pent up demand brings in the crowds. Or at some point they could raise ticket prices making it more expensive to bridge the gap between costs.
And hard to say when parks like HS will fill reservations... less than 1 month out or many? Will depend on capacity increases and attendance. Keep an eye on that situation.
You also risk waiting and finding out that the park is booked. I think Disney tries to be a PITA.
