Just for fun lets remember that some technology we cant envisage so to say this or that cant be real is true today but who knows.
However, again for fun you think AirPods or other in ear buds could have a forward facing camera? Love to see how silly those look

- also the 'hair' point remains - someone with long hair blocks both side and forward facing cameras its all the same.
And yes, iPhone into a restroom is a social, and in many cases, legal taboo. You don't take a phone into the showers and start filming people - phones in locker rooms are very much supposed to be left in bags for this very concern. Adding a camera to another device be it glasses, headphones, a watch or a pin or a ring.... the Principal will apply to ALL of them into the future.