Man the hardware scene is just so boring these days. 10% improvements are not exciting, no reason to upgrade. And they wonder why sales are slumping, its because there is no reason to upgrade.
Even if the 40-60%/year performance improvements had continued, most people today would likely still not bother to upgrade anywhere near as often as they used to due to lack of software that can actually put that extra processing power to good use.
Most computers out there today will rarely be used for anything much more intensive than video playback and today's low-end chips can easily handle multiple simultaneous 1080p streams even without GPU acceleration.
Even if AMD and Intel released 5X faster chips tomorrow, most people would not bother upgrading due to lack of mainstream software that can make any meaningful use of that: today's low-end chips are already overkill for most of what people do on a regular basis so for most people, it does not really matter much how much better today's chip might be until software catches up in a justifiable way.