That is my speculation as well. Once certain demographics consider their phones to be "good enough", they are going to use them until they break or apps stop w

That is my speculation as well. Once certain demographics consider their phones to be "good enough", they are going to use them until they break or apps stop working. Apple wants such people to feel to feel comfortable spending more money once they do upgrade their phone. A percentage of this higher cost is put into newer, more expensive hardware; this allows Apple to focus on differentiating technology on the higher end models (edge to edge retina screens! stupid-good cameras! no home button! facial recognition! you can video conference with your coworkers looking like animated poop!)