Publicly, Apple will say that it doesn't care about Android market share for all the usual reasons John Gruber repeats. But privately, if there was one thing that would keep me up at night as an Apple executive, that number would be it.
I don't know, I think China is more on their mind at the moment. It was Steve's crusade to destroy Google; I don't think that really exists in the same capacity anymore. Right now, Apple still make the most money, they're quite happy.