It's really simple, desktops were the first tools by people who just wanted to get news, Facebook, email etc. There was nothing else available. They needed a tool browse the internet or do some printing etc, maybe the casual game or two. Then they moved laptops, because of the advantage of having mobile computing. Now Mobiles and tablets are available, the % that don't buy desktops and laptops now, have no need for anything specific other than access to the internet, play games or do whatever. Ok, it's a little stereo typical, but that's what's happened. The PC was once a hobbiest machine, then games, the internet became popular with other none computer enthusiasts (again not the best label). They bought PC's to play games or access the internet. Just moving onto the next convinient machine. The rest are still using desktop and laptops, because they need the software, hardware for their hobby and/or job. Whilst others moved on, because they don't need that box under their desk. I still need a good machine for my work and items I do at home. But people I know, can do everything from their tablet/phone and that's fine. it's not the end of the desktop, it's the end of the dominance of the desktop.