I don't know why I didn't think of this earlier but as I was reading and thinking about force touch eventually joining the iPhone line up I realized that apple could easily one implement the force touch screen as a home button. Completely relinquishing the need for a physical button. Force touch can do everything a home button can aside from the Touch ID. But we know apple is working towards a Touch ID beneath the screen. This will be something many years from now but still! How exciting!