When someone like me thinks "No, I don't need an upgrade. My computers are many times faster than I need as it is.", I'm sure lots of people are thinking that, and it spells "deep hurting" on the horizon.
I have thought that for a long time.
I still have my first 'puter, a 166, on my network, and it's but slightly slower on the Internet than my newest, a 1.4GHZ.
The newer one is lighting fast on games where the 166 is a lot slower, but I don't play very many games.
My kids relegate me to the 166 when they want to play games.
I have never seen the need for the average person to have the latest and greatest until the technology of delivery catches up.
I am sure daytraders want the fastest they can get, but they are still limited by the pipeline.
The main difference that I can see is in the ability to have more RAM with the newer motherboards.