I think they could remove the face gasket to disallow a fully immersive experience? (like the Quest Pro, ironically)
That's never happening. That gasket is there to function not just for user comfort but also as a glasses spacer so glasses wearers can use it. Plus the gasket doesn't cost much if any to make, so there's no reason to get rid of it.
Also the Quest Pro was recently cancelled with no plans for a gen 2, while the Quest 3 still has a face gasket.
No outward facing screen?
Now this they could do. Hell the VR press after demoing the Vision Pro at WWDC the #1 thing they all agreed would be logical to cut in a consumer model was the outward display. A lot of people do not like the eye display and would rather it be gone completely.
Of course the question is, will Apple actually remove it? Probably not since they don't want to because "it needs to keep you from being isolated from others" despite the fact I don't want people seeing my eyes.
Unapologetically plastic?
Plastic would make sense since Quest and Pico are plastic. However it's unlikely they would do plastic since Apple doesn't do any plastic since the iPhone 5c, since they wanna be viewed as luxury and plastic doesn't give the look of luxury.
(Sidenote, I miss the plastic Macbooks. They were so good)
Lower resolution might happen but to be honest by the time it releases in 2025 or whatever, the prices for 4K screens may have come way down?
When you lower the resolution this could compromise text and content quality, which defeats the purpose of spatial computing.
Honestly I think a lot of the high cost issues with the Vision Pro is just the fact it's a pain in the ass to manufacture. A curved logic board, curved displays, the only people making the displays is Sony and Sony is prioritizing them for their PSVR 2 headset. It's one of the reasons Apple bought Mira Labs, to figure out how to easily mass produce HMDs to lower costs.