Everyone in this thread is defending the desktop as a stanchion of gaming. While that's true, there's a far more important user base for the desktop: professionals.
Even though the desktop is waning, there are several usage areas where it won't ever go away.
First example, I do web design/coding/other assorted IT related tasks. Doing my work on a laptop is hilariously inefficient and uncomfortable.
Creative professionals. A photo editor, or a video editor isn't going to switch to a laptop/powerful tablet just because consumers are. There's a reason 1440p displays are becoming mainstream, and its' not just gamers who are bringing it about. A powerful desktop is essential for the workflow of a lot of people.
System administrators, support personal, in general anyone involved in IT at the enterprise level is going to want a desktop; a fast one, with several monitors. Anything less than that is a waste of the employees' time. Also, from a business standpoint, laptops make zero sense, except as secondary devices, or as equipment for mobile workers. For workers who are in-office from 9 to 5, a desktop is cheaper to maintain, easier to upgrade and repair, and more reliable and powerful than a laptop is. That's just good economics, right there.
So while the desktop in the consumer side may be dropping off, on the gaming/business/professional side? No chance. I'm not giving up a mouse, keyboard, and multiple monitors just because the industry journalists want everyone to believe the PC is dying. Is the PC receding? Yes. Is it going to die? Oh hell no.