Performance/watt is the key. And yes the desktop is dead.
Servers love it. Mobile love it. Massive improvements in both.
Don't make stuff up. My Feb 2013 IVB i7-3635QM is a quad-core i7 with HT and has a maximum boost of
3.2Ghz on 4 cores. Its replacement, a $378 OEM chip, is an i7-6820HQ that boosts to 3.2Ghz on 4 cores. That means there is still no viable upgrade path as a 20% boost in nearly 3 years is a joke. The only incentives for upgrading is to get a PCIe SSD and a faster GPU or a higher resolution display than 1080P. CPU speed isn't a factor.
Per AT:
Ivy Bridge to Haswell: Average ~11.2% Up
Haswell to Broadwell: Average ~3.3% Up
Broadwell to Skylake (DDR4): Average ~2.7% Up
==> 1.112 x 1.033 x 1.027 =
Barely an 18% increase in IPC.
I doubt that i7-6820HQ will manage to even get 8 points in
Cinebench R11.5 64Bit. The only way to even get 30%+ performance increase is if you get a 8-10 lbs gaming laptop where the cooling system is sufficient to overclock the Skylake i7 but overclocking isn't an option on most 4.5-5.5 lbs laptops; OR spend big bucks for the $600-1000 mobile CPU options. That means by February 2016, there will only be a 20% increase in performance at the similar price level vs. say an i7 3635QM, which is far from MASSIVE as you put it. For other gamers who have an even faster i7 than 3635QM, Skylake mobile CPUs are a joke of an upgrade unless one has $ to burn or needs every ounce of performance for 980M SLI laptop.
At this pace, it'll take 4-5 years before it's worth upgrading on the mobile CPU side from a Core i7 IVB/Haswell 45-47W CPU.
Businesses might be on a 2-3 year cadence but most consumers aren't, unless they are gamers. If we include Apple's laptops, I wouldn't be surprised if most Mac owners are on a 5+ year upgrade cycle. Even a basic Core i3 laptop with a modern Samsung 850 512GB-1TB SSD is more than enough for most stuff people use their laptop for (students, business professionals, etc.). I bet a lot of new laptop purchases are coming from natural consumer evolution cycle (i.e., a human eventually turns 18 and needs to go to college/university, needs a laptop for work so they buy one). That means there will be demand for any generation of Intel's CPUs simply because of new generations of humans replacing older ones but the generation that has primarily finished undergraduate/masters today has little reason to get a new laptop. For companies that require workers to use a laptop at work in developed countries, these employees get their laptops for free which gives them less reason to buy their own laptop too.
Stop thinking one quarter at a time and think 10 years down the line.
In the last 3 years I haven't met anyone at work or outside of work over the age of 50 who bought a new laptop. From anecdotal evidence, most adults today are much more likely to get a new larger smartphone and/or a tablet. Some of my friends are still on 2008-2012 laptops and they have no interest in upgrading other than dropping in an SSD/up the RAM and upgrade to Windows 10. For those who require a laptop/desktop for work, the company provides it.
Even if Intel's CPUs increased in performance at 10-11% per annum, it would take an astounding
~7 years for the CPU speed to roughly double. For someone who is rendering, needs a lot of horsepower for professional applications, they are going X99 platform (or whatever the equivalent is), or Xeons and not focusing that much on laptops for horsepower. If time (as in tied to the speed or processing a CPU-related business task) = $$$ for a professional business, no quad-core i7 laptop is good enough. For everyone else who is a non-gamer, even if CPU speed increases 50-100% in the next 5-7 years, are they going to time that it took 3 seconds less to open Microsoft Suite?
The biggest reasons for upgrading a laptop are not CPU related - old laptop breaks/the battery is shot and it's not replaceable, faster storage (SSDs/PCIe), better screens, desire for lower weight and longer battery times, faster GPUs for gaming. I doubt most consumers care about small annual increases in CPU performance and Intel is no rush to sell a $250 6-core CPU either. On the gaming side, which is a big market and has seen a lot of growth in laptops in the last 5 years, the laptop gamer is likely to buy a new laptop let's say in 2-3 years for the increased GPU performance but with that comes a "free" CPU upgrade since gaming laptops have the latest Intel CPU architectures. But it doesn't mean their primary motivator for upgrading their laptop was for more CPU speed.
It's no wonder Intel's revenues and profits are skyrocketing since they are selling $230-350 i5/i7 CPUs with <130mm2 die sizes.