When you look at the data we have now we see: Zen (8 Core) > Coffee Lake (6 Core) > Zen+ (8 Core refined?) > Ice Lake (8 Core) > Zen 2 (12 Core).
Now, do I believe 8 Core is gonna be the standard for Gaming and Productivity?
Absolutely yes, and it's all happening before 2020.
Is it gonna be the same for Web Browsing, Light Media and Office PCs?
No, even when Zen 2 arrives, I believe the cheapest and most accessible is gonna be a 6 Core Processor.
The time is right, 7 years ago I quit PC Gaming and went back to Consoles, but things are much better now. We're close to achieving Photorealism and in order to create a realistic world in a convincing matter, heavy AI use is inevitable, which leads to more processing power and better utilization. We have seen a glimpse of the future this year with Assassin's Creed Origins, heck the game utilizes a Threadripper, which is very impressive. More to come and i'm looking forward to seeing it.