The prices of the processors alone + MoBo will be rather expensive, specially if the user goes to K edition.
To be honest, only a handfu l of people will benefit from improved Processors.
Gamers focus mostly on GPU with a decent CPU and tons of Cooling (depending on the gamer, ram ranges from 4 to 8. Anything over than 8 is just overkill unless you are a hardcore gamer with a top end gaming rig and even so).
Graphic designers and video makers, will go with CPU + GPU high ends and over 16GB ram.
Average joe will get a desktop on deals which is known to have cheaper parts etc (i.e. i7 processor but then a weak gpu and medium hdd and just 4gb ram and an ok MoBo).
PC Builders and enthusiastics will build a high end rig and then mission accomplished or end up trashing because they overclocked too much or missed out some specific watercooling component etc.
Regardless, if we look at what happened to the i7's before second generation, everyone with decent common sense will stay away for awhile from new Intel processors, just to be on the safe side before they are recalled etc, or even wait for a 2nd generation version, like many did on i7's sandy bridge for example.