Good post. None of the parties mentioned, Apple, Google or Amazon really care about owning app distribution. It's something they do to increase the desirability of their devices.

Apple does it so they can sell more iDevices, Google does it so more people want to buy Android devices and see their ads, Amazon does it because they want people to have Kindles to buy their other digital goods.

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Not that this is likely, but I don't think Google would be happy if Amazon took over app distribution. They wouldn't want another company in the middle that could dictate terms to Google. Remember how for a while it looked like Apple was going to banish Google ads from iOS apps.