This is just a theory of mine. Since the Home button takes up too much space and Apple prefers keeping symmetry between the top and bottom of the iPhone.... what if they added a Touch Bar at the bottom of the phone that took up considerably less space and also included a built in Touch ID sensor into the Touch Bar? Do you think this might be a possibility? It would allow for virtual on screen controls which are always present or contextually change per app to allow quick access just like the MacBook Pro. You could have an always present Home Button, use it as an always on display to show notifications etc - all of course with the Touch Bar being possibly a second OLED display that seamlessly integrates with the main display to make it all look like one piece. Thoughts?