LOL Man you should work for AMD. Rory would love you. Or you could work for RIM. You could explain how no one needs those features the Iphone have. Or you could work for a large number of failed companies who believed that increased performance was meaningless.
The reality is that has become a false dichotomy. On the top level everything seems to be fine, with just about any processor able to meet current demand. But underneath is the truth. The truth is that 1080p is holding us back. Don't believe me? Well take it up with Apple as well, because it has finally recognized that consumers want a better display, hence the retina display. The fact is that processor only seem to be "fast enough" because PC buyers are willing to put up with crummy displays and we let the hardware manufacturers get away with making crummy displays because we keep buying them.
Of course performance does always matter, even beyond the display issues. A faster processor will still let the computer operate slightly faster which helps productivity and it will open up new possible uses for the computer which it may not currently be being used for such as AI.
Then there is the issue of DARPA which also wants faster CPUs and those boys are going to get what they want.....
And finally there is the issue of the consumer. Give someone a choice between two otherwise equal devices but one is better, the consumer will 95 percent of the time, pick the better device. Even if you don't use all the power Intel offers you will still pick it because it is better.