Yes they can afford it because their fan base is large enough to keep the same design for another 2 years. Look at the iPhone SE. Pretty old design but still sells. People just love the OS and how "clean and simple" it is, and that's all they care about. I have friends that still are hanging on to their iPhone 5 because they love that size and don't want a darn thing to change, refusing to ever upgrade. But you're right, Samsung has drastically improved so much in so many areas, I could understand why Apple is now teaming up with Samsung to help develop their new AMOLED display for the anniversary edition iPhone. I think that's the only thing that will make the iPhone exciting again, otherwise it's the same old usual, maybe a new color option.