I definitely agree that I think Phantom Theater return is on the table somewhere in there, 2024,2025,2026, somewhere in there.
Personally if we got a multi-launch I would want to see it utilize the crypt building, wheter that be just as a station/portion of "dark theming" before going outside, or with adding to the structure to do something fully enclosed, but the biggest thing id like to see that would be awesome is to make a multilaunch capacity monster with a dual load & unload, IE the setup guardians at Epcot has.