Something to keep in mind, gaming consoles and pc's are not the same. The reason for such heavily threaded 8 core in say the ps4 running the amd jaguar isn't because multiple threading alone is the end all be all. It's a solution to allow higher processing capability in a unit that's a very small form factor and has things like power and cooling restraints. If you can't put something fast and hot inside a small box, lower the clocks and spread it sideways in parallel with multithreading. Pc's don't suffer this problem, they're not consoles. If anything, consoles are trying to become more like pc's, not the other way around. Consoles are also strictly hardwired for gaming, much like a bitcoin miner is designed to mine bitcoins. Pc's aren't designed this way, they're designed to be multipurpose.
What's also funny is all the speculation. Everyone tries to hold up the crystal ball and tell the future of how things will be. One such case was an article from 2 years ago, april of 2013 from redgamingtech's site. "One concern we’ve got is that Intel’s Haswell marks the last of the CPU’s made by Intel (at least that’s known so far) which will be user upgradeable. All other CPU’s will be part of the motherboard, which means upgrading is a lot more difficult." Yet here we are in the heyday of haswell, broadwell being released, skylake soon to come out with cannonlake in the works - all socketed cpu's, business as usual. No soc chip style permanent cpu's in the motherboards. I can't fault people for trying to make an educated guess but at the same time they couldn't get things more wrong.
Fast forward to present day and current speculations about dx12 and games needing oodles of cores to run. It's really no different. It goes back to common sense, improvements are getting harder and harder to come by. Silicon can only be pushed so fast, so when reaching the physical limitations of the materials, adding more frequency hits a ceiling eventually. Now other measures have to be taken to squeeze more performance, improve efficiency so the average system doesn't require a 1500w psu to run it. Die shrinks gave intel all kinds of problems, hence the delay with broadwell. Game devs would be foolish to design their software for hardware that either doesn't exist or for hardware that only encompasses a fraction of the users. They work in tandem with hardware manufacturers. If quad cores were no longer useful, intel would stop making them. If game devs want fatter pay days, they're not going to pander to the minority with 8 core/thread cpu's. That would cancel out all those gaming with 6 core and quad core fx chips, not to mention the 860k and others on the amd side, along with all the i5, i3 and pentium g owners. Pretty much half of amd and intel's lineup. It just doesn't make sense from a business standpoint and money drives business, not tech.