The problem is for the vast majority? To use a car analogy its like using a top fuel funny car to go to the store for milk, they have more power than they can possibly use.
Take my dad for example, he is the perfect "Joe Average" user. he uses social media, watches videos, uses his bookkeeping software, the kind of everyday tasks the majority do daily. When the price dropped on the Phenom IIs to make way for the FX I thought "Well it has been awhile since I built him that Phenom I quad so maybe its time for an upgrade" and ran a usage monitor for a week to see how bad he was hitting the CPU,what did I find? 35%. That is the average amount of usage that quad was getting. Sure he'd get occasionally over 50% but that was only for a few seconds.
And THAT is why its really not gonna matter to Joe and Jane average, because their systems already idle more than they run and the prices are already crazy cheap. I mean I just got dad a quad core Android tablet for Xmas.,..think he'll EVER come up with enough to do to peg all 4 cores enough that an upgrade would help? Not likely. Hell I was the guy that built a new system every other year with a major overhaul on the odd years,now? My system is 4 years old and I have zero reason to upgrade to a new one. Why should I? I have a hexacore, 8Gb of RAM, 3TB of HDD, the only thing I upgraded was my HD4850 for an HD7750 and even that was about lowering heat and not performance.
Lets face it, Moore's Law made systems several orders more powerful than the work the masses can come up for them to do. Who cares if Moore's Law finally winds down when the systems are so powerful they spend more time idling than anything else?