Seems like Chrome OS should be folded into Android and many people would be comfortable using it at home. Same apps could run and sync on all devices.
Actually, ChromeOS isn't just for netbooks. It's for a world where everything you want to do on your computer is available via a web service. Netbooks happen to be suitable for ChromeOS now because the web services available today generally don't require much heavy lifting client-side. Especially if NaCl/PNaCl takes off (who knows?) that very well may change soon.
That's why ChromeOS as designed is, in my opinion, actually unlikely to become defunct anytime soon: I personally suspect the percentage of consumers for which ChromeOS's capabilities are sufficient will continue to rise over the next few years.