In Pictures: 8 reasons why Chromebooks aren’t goin...
Chromebooks (and Chrome OS) are a testbed for Chrome browser
Because Chrome OS is basically Chrome the browser running atop a minimal Linux distro, the development work that goes into Chrome OS may show up in the browser. Consider the app launcher, which was brought over to the desktop versions of Chrome. So while Chromebooks may pose no threat to Windows machines for the time being, it looks like Google could keep the development of Chrome OS ongoing indefinitely by justifying it as a project that benefits Chrome the browser.
In Pictures: 8 reasons why Chromebooks aren’t going away