One thing I was thinking of recently, is that maybe foldable phones could solve two issues for Apple at once.
They want to push 3D headsets for spatial computing, but these are really expensive currently when done well, and it's a lot of effort to drive down costs.
Meanwhile that's always an aded expense to other things you need other than have, like a phone.
But what if a cheaper version of a 3D headset, used the foldable nature to work better as the display part of a 3D headset?
That is to say, you would be able to slot a phone into something like the Vision Pro, and use the phone screens as the screens for the headset.
It would fit better on your face folding since it would wrap around your face better. The optics might be a little odd but I'm sure they could be adapted for.
The headset would still have it's own processing and camera/sensor hardware for passthrough.
Essentially it would be a super-high end take on Google Cardboard... and Google Cardboard did work so the idea has some merit.