Sony don't care as long as PS4s continue to sell and there's no signs of them slowing down. They easily have the room for price drops and first party content to milk it until 2020, where radically better CPU, GPU, and Memory architecture will be available and fit for a console at a reasonable price point. Not to mention 10nmFF node process without the premiums.
You are getting very very little increase in delta performance over X1X on this architecture. They could push a new box out in 2019, but again, if sales are still good and X1X isn't really gaining significant market share beyond just X1 owners upgrading, there's no point rushing out new hardware.

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