Re: No, Liam, I won't be using a fondleslab as my primary computer.
New tools rarely replace old tools outright. Since buying electric drills and screwdrivers I have not thrown away my hammers, or manual screwdrivers, nor will I. I use tablets (just got an ASUS Transformer Pad cheaply, like the hybrid set-up) and like them for browsing, but I still use my laptop and desktop machines (writing articles and coding), and when I need more serious grunt (Gigapixel images) a 64 core compute server, and when I want to play with the big boys with big data: clusters or supercomputers. I use WIMP or touch as needed, but very often still use the command line. As new tools are added to the toolbox, we gain flexibility. Do most users need the command line? I would not think so. Do I see my students use the command line? Not as much as I do, but they still revert to it for certain types of work.
I love using editors, or word processors, but boy am I glad I still have pen, pencil and paper.
I might also suggest PC sales are going down because many people have PCs that work just fine, and are in no hurry to upgrade.