Regular Windows/OS X laptops are a dying breed. Even these 'ultrabooks' can't save it.
People are buying tablets & smartphones. But most people still want fully-fledged browsers & a keyboard for home/office work.
Answer? Chromebooks. For the average consumer a Chromebook is perfect. And with the steps Google are making to making Chrome OS feel more like a proper operating system, there's no way around it. See for yourself.
I disagree. Mac Sales has actually grown. (https://www.macrumors.com/2014/01/09/gartner-pcmarket-statistics/) Macs and higher-end PCs are usually bought by people who need the computing power, real applications(I'm not discounting the apps Google makes, but they aren't close to the real pro apps), and the ability to be on different platforms and use services that aren't Google's. I think ChromeBooks are eating their way into the ~$300 former netbook segment, but they are in no ways really competing with Macs and Ultrabooks(that aren't cheap).