While I appreciate the lightening of the load of websites to something more manageable and reducing overprovisioning, it should be stated that data centers are more efficient, in that they spend fewer watts for the same number of gigahertz, compared to at-point computer rooms or even personal computers. Clouds reduce energy consumption, not increase it.
I've always struggled with the application of Jevon's paradox to decision making. Does it mean we shouldn't try to make our usage of scarce resources more efficient?