From bad to worse
The PC market has always been a tough one, but the one thing that made it profitable in the last 40 years was ever significant improvements in power and capability.
From barely running a spreadsheet with only numbered or lettered menus that were very limited, to animated graphical interfaces that let one use a spreadsheet like a database or will directly tie into a real database, PC's have come a very long way.
Now that the average PC can run a small business, play high resolution 3D games, watch or even make/edit high resolution video, access the Internet and everything on it, all at he same time and make 3D models, what more does the average person need?
Then there is the used market. When I can buy a factory refurbished PC that will do all of the above things for half the price of new, why would I buy new?
And last, but not least, operating systems. Windows has seriously made a huge mistake with 8 and 10. Linux is growing every year and is no longer hard to install, maintain and use. Besides some companies who make certain specialized productivity software that still has no Linux equivalent, Microsoft would already be dead.
It would seem to me that PC makers would be better off selling the virtues of Linux to move their product. The average person will never know the difference.