So if they will offer Ivy/Haswell IPC with 50% more Cores/Threads at the same price you will go for Higher IPC and less cores/Treads in 2017 and DX-12/Vulkan era ????
I would. What's the point of having excess of slower CPU cores? Unless you do video encoding, rendering, encryption, distributed computing and workstation tasks, those extra cores are a nice paper spec, just like it is on the 6850K, 6900K and 6950X. Just like with high-end modern motherboards, a PC user really has to ask themselves what features are they really going to use and are they worth paying for?
I am yet to find a DX12/Vulkan PC game where the 8-10 core 6900 models are significantly faster than the i7 6700K. Maybe Total War: Warhammer? Not to mention, who buys an 8-10 core modern CPU and games at 1080p 60Hz?
Also, what makes you think AMD will sell an 8 core HT Zen for $349?
For probably 90% of PC gamers with limited budgets sitting on 1080p 60Hz + GTX1070 and below, they are better off buying a $180 Core i5-6400/6500 and a $100 Asus Z170-E/Asrock Z170 Extreme4/Pro4 and overclocking via BCLK to 4.5-4.6Ghz. The chance that AMD will have anything better than that for gaming at $180 is small imo.
I would love to be proven wrong but Kaby Lake will be even faster out of the box and should overclock better than Skylake. I have a feeling it won't be until 2018 or even later than PC games start to really use 6-8 cores.
For Ivy/Haswel users on i7 3770K/4770K/4790K, how is even an 8-core Zen an upgrade for gaming? For 2600K users who skipped Skylake, Haswell-E and Broadwell-E, it seems they are waiting for even faster CPU cores. If they haven't upgraded to those 3, it seems odd that they would upgrade to Zen either.
As I said before, for me, Zen is a workstation/multi-threaded/server play. That's where AMD has the greatest chance to gain market share and earn $$$.
If AMD wants to sell 8 slower cores, it needs to work with 2-3 developers on major AAA DX12/Vulkan titles and ensure that Zen convincingly beats 6700K and 6800K in these games. If that happens, PC gamers will get nervous that future titles are starting to become heavily threaded and become reluctant to build new gaming rigs around quad-core CPUs.
Here is a random game "no one plays" that mostly used just 2 cores; and because of lack of multi-threading in the game, it helps to show just how far behind AMD is in IPC:
i5 6600 is
129% faster than 8150, and
89% faster than 8350:
http://gamegpu.com/rts-/-стратегии/cossacks-3-test-gpu
40% gain in IPC is nowhere close to even catching up to Haswell.