As the update to the article quotes:

> The chances I leave [Apple] are minimal because I have all my music and photos and such on the phone. The inertia or friction of moving is fairly high.

This is also starting to become true with the kindle for consumers.

Another advantage of Amazon however is its many business customers - i.e. those who use and rely on AWS. I would imagine the friction of moving away from AWS are even higher for a business than for an end-user to transfer their songs and videos...