I don't know about that. Certainly there are large differences under the hood, but isn't Chrome OS just supposed to run browser apps really well? I don't think that's a very hard compatibility measure for Android to match.
The entire point of Chrome OS is that it's only the browser. Saying you want Chrome OS merged with Android is the same as saying you just want a Chrome APK. Chrome OS's key tenets of security and simplicity are simply not compatible with traditional operating systems.
