First, a disclaimer: I also overwhelmingly prefer ChromeOS over Android for a bunch of reasons and wish that if they had to merge them the result was a thin Android compatibility layer on the much more robust bones of ChromeOS.
That said... if Google wants to fold ChromeOS into Android, I think they'll have to make Android fully supported on x86 as a first-class platform (because most Chromebooks are x86). And if they do that, they should have little problem making a... Android Flex or whatever you'd call it that boots on normal PC hardware just like ChromeOS Flex does today and fills the same role.
That said... if Google wants to fold ChromeOS into Android, I think they'll have to make Android fully supported on x86 as a first-class platform (because most Chromebooks are x86). And if they do that, they should have little problem making a... Android Flex or whatever you'd call it that boots on normal PC hardware just like ChromeOS Flex does today and fills the same role.