More important then just a GPU upgrade is a CPU upgrade. We have been seeing games be CPU limited already this generation. Sony should have upgraded their CPU in Neo if the rumors are correct and they are using the same Jaguar CPU just with an additional 500Mhz clock boost. I expect Microsoft to be using the new Zen architecture which would be a significant boost over the old Jaguar CPU's in the Xbox One and PS4 (at least I hope one of the console manufacturers use a better CPU).
Agreed, I hope so too.
Scorpio in fall 2017 should be good timing for Zen, which hits the PC market late this year.