The Chrome Extensions support is the interesting part here. That's often the dealbreaker for using mobile devices as computer replacements.

Google's had this weird situation where Android and ChromeOS overlap more every year. At some point maintaining two operating systems with converging feature sets seems wasteful.

My guess: ChromeOS probably survives for the education market where manageability matters more than capabilities. But for consumers? Android on a big screen with keyboard and mouse might just be good enough.