The reason the business market is "dying" is that the hardware itself has been more than capable of dealing with business tasks for years. With central OS updates by the business, they're all running Windows 7, regardless of what was running on them when purchased. So those "old" machines are perfectly serviceable for the business, and the businesses are not upgrading and replacing them nearly as often as they used to.
The same issue is hitting the home consumer market. Just how much raw CPU do you think it requires to run Word, email, a browser, and watch a video? That's all most home users do. Very, very few of the machines sold are gaming machines, and even fewer are used for CPU intensive tasks like video processing or encoding.
Bottom line: People don't need new machines. So instead of buying a new PC, they're buying toys like tablets and the latest whizz-bang cell phones. If the old PC ever dies, then they'll replace it. And join the crowd in bitching about Windows 8.