This sounds insane on the surface, but since Google doesn't seem to want to mention Android during their earnings calls it might not be an insane idea.
They're obviously never going to do it, but evidence suggests that if it WERE to happen, it wouldn't be financially irresponsible.
Android is given away for FREE. Thus by that very definition it CANNOT generate earnings for Google. Thus no need to mention it in an earnings meeting.
And yes, it would be an insane idea. It would mean Google would likely be surrendering the entire mobile advertising market to competitors. If Google kills Android, all Apple has to do is come out and revise the developer rules to only allow iAds for in-app advertising. They already revised the rules once to competitively disadvantage Google's ads by preventing location-based data collection. With the push to more connected mobile devices, it would very much be financially irresponsible to be at the mercy of other companies for access to that market.