Excellent point on this. The blank screen simply won't do for this attraction. It would completely take you out of the attraction.
This has to be themed along the lines of the Hogwarts Express at Uni or the Tree of Life and It's Tough to Be a Bug at AK. In each case, great care was taken to make you feel like you are somewhere else. For HE, the screens in the windows are never blank; when you first board, they show a brick wall with steam rising in front, then street views of London before finally transitioning to the actual attraction. For ITTBAB, the entire queue and holding area makes you feel like you've been shrunk to the size of a bug. Even the theater itself works to complete the illusion you are in a giant tree. And you never see the edge of a screen. Flight of Passage needs to emulate the designs of these attractions.
It simply will not work to walk from this:
into this:
Agree actually. The feet are annoying!
Suspension of belief is easy at Soarin' due to the nature and theme of the attraction. It's in a section of a theme park that showcases distinct, unrelated experiences rather than immersion in one cohesive narrative. In other words, it is very easy to ignore the blank screen at Soarin' because everything leading up to it is unconnected. It's a very compartmentalized experience. You enjoy Soarin' for what it is because that's all it is - a nice film that simulates flying.
That is not the case with Avatarland where everything centers on you (the guest) exploring a literal world of Pandora. Everything, from the attractions to the restaurants to the plants and the rock work, are there to make you feel like you are on this alien planet. As such, you can't have a blank screen as it would be a glaring acknowledgement that Pandora is all fake (which it is, but that's not what Disney wants to convey). I'd say you can't even show plain metal switchback rails or bare chain link. This attraction is not meant to be a nice film that simulates flying; this is meant to be a thrilling exploration of Pandora.
For Disney to pull this off, it can't even look like we are waiting in a massive show building. They need to theme to so that it looks like we are climbing through a mountain rain forest up to a cliff top perch. It all has to "flow" in a way that FoP is an experience rather than "just a ride." Should fun to see what they come up with!