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You remind me of the guys who argued with me early last year about what Broadwell E pricing was going to be. Those guys INSISTED that the 10 core model would slide into the previous pricing tier occupied by the 8 core model ($999), the 8 core model would slide down into the top 6 core model tier, etc. I told them there was no way - zero, zilch, nada - that the 10 core model was going to be less than $1200-$1300 and the other models would slide into their existing tiers because Intel had no incentive to do so - AMD was simply not providing ANY competition to force Intel to drop prices. I was obviously right but even I didn't comprehend that Intel would gouge THAT MUCH on the 10 core model.
While this new competition is great and hopefully helps us on pricing, what you are forgetting is that 1) PC sales are continuing to drop year after year and you'll note where Intel's real focus has been over the past few years and 2) HEDT is a niche market for Intel and it is just a way for them to make huge margins (on relatively low volume sales) with little effort or expense. Ryzen is obviously a nice product and I do think it will put SOME pricing pressure on Intel, but you're not going to see the 12 core SKL-X sell for $800 and probably not even $1000, though I would be EXTREMELY happy to be wrong on this point.
Multi-cores are not a "new frontier" by any stretch of the imagination. Multi-core CPUs have been available to consumers since 2004 or 2005. I bought my first in 2005 or 2006 IIRC (Athlon X2 4800, which was a fabulous CPU). Quad cores were plentiful by 2007 and hex cores were introduced in what, 2009 or 2010? Even with all of that, you'll note from gaming benches that most games are still not benefitting tremendously from 6+ core CPUs - sure, a few games obviously do, but the GPU is still the single biggest performance booster for a gaming PC and I don't think that will change in the near future. Hopefully the proliferation of 6+ core CPUs WILL spur developers to take more advantage of additional cores but I think it is still a little ways off.