Doesn't mean they failed. If they develop and OS after the leader at the time already has a foothold on the market and then a few years later surpasses the former leader, that is not a definition of failure. They may make a wide range of products from very cheep to very good, but they are still profiting and growing. That does not a failure make.
Keep in mind that I have Android and iOS products, and prefer iOS much more over Android. I can still acknowledge the fact that they are in no way a failure.
Android is NOT a failure; the android market is. As a direct consequence of the open-nature of it that everyone claims to love.