Moar cores wouldn't do anything. If you think lack of competition is doing anything and Intel is just sitting on its hands while the PC segment declines?
You need a reality check.
Maybe for you but not necessarily for the vast majority of the 99 percent, that number is egregiously wrong btw, as going for quad (or hexa) core would be an option if the price is right. Intel could very well sell a quad core (plus HT) with a modest GPU for 200$ but oh no they love their margins so much that they'd rather not sell to the crowd looking for a relatively cheap upgrade (200~250$) than to sell them a $350 chip, or 250$ for an i5, for cheaps!
This is what I call hubris ~ they'll sell you what they think you deserve (quad core) & only at the price (at least $250) they believe is right for you. This aside from the fact that you have to buy a new mobo virtually every new generation, ya tell me that isn't a ripoff!
6700K etc sells like hotcakes. Because people prioritizing it buys it. The chips not selling are in much lower segments. And its not because people dont want to upgrade, its because they cant. Same applies for the completely disasterous GPU segment.
Yes because the crowd that buys them is insatiable & change hardware just like the folks who buy new iphones each year, maybe out of (bad?) habit.
It's not just because of people not having the ability to buy new gear, also (mostly) due to the fact that they value their money more! Buying a new mobo (each gen) & sinking 250~400$ for a mainstream part isn't great VFM for me, likewise for many others. If you can't see the obvious, Intel's greed, you're seemingly (deliberately?) obfuscating the argument to fit your narrative i.e. people don't (or can't) pay
good money for great products, they do just that it's hard to justify getting a measly 5~10% uplift in performance for 500~600$ & yes a new platform based on DDR4 will cost at least that much in most parts of the world if not more!
Bottom line, the 5~10% decline is attributable to the state of the global economy & saturation in this market but anything over & above that is pure greed & hubris on Intel's part ergo
people not getting what they want -> this is at least 50~70% of the consumer market that some users here like to call names!