I'm curious how this plays out -- not sure attendance would justify it. Anecdotally I've never gotten a sense 3-park APs were flying off the shelves. In fairness, water park option surprisingly rare around WDW APs as well.
On that subject, "Another Voice" --used to be THE expert on Disney back when the DisBoard was huge, still pops up on Twitter -- theorizes neither WDW water park re-opens this year, obstensibly for safety but in reality because to save costs. I don't know if VB and Aquatica follow that money-saving lead (latter is assuming SWO even opens again), or try to cash in on an untapped market.