Chromebook and hybrid tablets are slowly eating into the "laptop" market. Many people will never buy a laptop because their tablet or phone does what they need. I know a lot of people who go weeks between opening their computer, but live on their phone and tablet. Desktop and laptop will be a thing people use at work for a long while, and it'll probably still be ruled by Windows. Creatives and developers will have beefy computers, and they'll probably still be running Windows and Mac OS X predominantly (though I use Fedora, and have never really worked on anything other than a Linux system). For now. I can't predict what will happen on that front, but phones and tablets are encroaching on so many fronts I never would have predicted (I just bought my first tablet last week, and thought they were ridiculous for years even after they'd started taking off).