The desktop as we know it is just hardware. What would I replace it with?
I don't really care about the physical size of the 'unit.' What I care about is the interface and the 'unit's' performance.
I use a multi-screen setup and need a good kb and mouse (pointing device). The processor must be fast enough (no need to be a speed demon), and adequate memory. Adequate data storage is a key, and its archiving which is a critical point. I'm not so worried if it's SSD or HD.
I also need to 'go mobile.' The latest smartphones are great for that, but inadequate to replace the desktop.
It's straightforward in my mind: I need a desktop.
Now, if I wasn't doing the work i'm doing, it may be a different story.
I agree, it's not the end of the desktop, but I think it has been the end of the desktop as a mass market item since the iPad and smartphones became mainstream.