I look at this in my most recent
article at elitzr.
The genesis for my piece was the r
ecent article at Futurebook that looks at Google's cloud-centric approach and suggests it may be a sustainable competitive advantage for Google.
I tend to think Amazon, Apple and others will eventually adjust, and Amazon in particular will not hesitate to make the Kindle app and store a "service" that can be consumed in the clouds.
What do you think?