I don't understand why you're choosing this hill to die on and what point you're trying to make. You mentionned chromeos is gentoo underneath. Why don't you attribute it's success to gentoo? You're nitpicking on everything i said even irrelevant stuff (who cares who actually builds chromebooks? they are still google-stamped). And come on, are you really comparing the power and influence of redhat and google on consumers? Virtually no-one on the street knows about redhat (or any kind of linux corp), now google...
Something as fundamental and basic like consumer operating systems is basically unmovable and what people use has little to do with what's available and mostly with historical inertia and the state of worldwide tech politics. You're saying it yourself, linux was ready for years. To move anything you will have to exert tremendous social influence. People don't choose their OS, they are mostly conciliating between their job, their education and their family's or friend's tradition. So once again: chromeos being widespread is not an indicator of it's qualities (i'm sure it's perfectly fine tho), but just a measure of google's influence.