I have been thinking how the rumoured LCD 6.1" Fits into the lineup. One possibilities is 6.1" isn’t actually the screen size at all, but the actual casing. So Apple will have a FaceID iPhone that doesn’t have the notch, it will be slightly taller and has black bar above for FaceID, its screen size is basically the same 5.8" iPhone X. Let’s call that iPhone 9, Basically longer iPhone X with FaceID but without the notch, Retina LCD display instead of Super Retina with OLED, Aluminium casing instead of the more expensive Steel. It will basically serve the middle tier market. So by 2020, the iPhone Line up could be something like (By iPhone X I mean the Notch Design ) iPhone X 6.5" $999 iPhone X 5.8" $899 iPhone X 4.9" $799 iPhone 9 6.5" $699 iPhone 9 5.8" $599 iPhone 7 5.5" $499 iPhone 7 4.7" $399 iPhone SE 4.0" $299 This way, Apple can innovate whatever they want in the top tier. Trying to ship 200M+ iPhone with state of the art technology every year is very much something even Apple cant cope. By have all the latest tech and innovation at their top tier price, the sales volume should be easier, not to mention this actually improves margin. iPhone 7 and SE design will be Touch ID base, and Apple may only update the internal every once in a while. kind of like the iPad. And it will serve the bottom end market for a long time to come. It has been 10 years since the Smartphone revolution. And the whole world smartphone market, including China are starting to get mature. Phone upgrade pace are slowing down, it seems price segmentation and lineup, is likely what apple will do, much like its iPod at its late stage of cycle.