Apple's pretty good at accessibility, they may have thought of that with one of their settings.
They seem to work so hard at making sure all their products work well for people various levels of vision problems I have to believe they would've done something. After all even the Apple TV has support for people with total vision loss. I don't see why they'd break their flagship product.
If it's true that touch id was expected to ship until a couple months ago they may not have found an alternative. If they are expecting touch id to be in next years model I could see them not making face unlock accessible since you can still get new iPhones with touch id. Remember Apple did not make the iPhone accessible until the 3gs, so there's no guarantee that new features will be accessible.
I wasn't aware that the 3G didn't have accessibility, but they've trumpeted it a lot over the last few years so I have a hard time thinking they would just give it up.
I mean you could just make a setting that ignores whether someone is "looking" at the phone. It would make it a little less secure but at least it would still work.
I have a very hard time believing the rumors that they took touch ID out at the last moment. Maybe when people do teardowns will see some empty space but I figured that something they would've had to lock down early in the year.
I've got to admit I'll miss touch ID. I wonder if it'll ever come back if they figure out a way to get that sensor-under-the-screen thing going, or at this point do they just decide Face ID is good enough and go forward with it alone?
They seem to work so hard at making sure all their products work well for people various levels of vision problems I have to believe they would've done something. After all even the Apple TV has support for people with total vision loss. I don't see why they'd break their flagship product.