I can't see the iPhone X dropping $500-$600 next year. The iPhone 7 was only dropped $100 today. Also that gets real wonky if this is the iPhone X(10), and then next year they release a successor to the iPhone 8 named the iPhone 11 and an iPhone X successor with who knows what name. Marketing plays a huge role in what products get released, and I think Apple may have backed itself into a marketing corner here. My best guess is they'll probably drop the X to around $849 (only $50 more than the 8 Plus), and offer an iPhone X2 at $999 (and continue the pattern as X3, X4, etc.). But then I don't know how they handle the 4.7 and 5.5 models.