Desktop giving way to the cloud, poll says
sfgate.com
sfgate.com
The real advantages of the cloud (when considering the cloud as a "desktop alternative") are a known, homogeneous execution environment, easy installation, updates and maintenance. However, these advantages are all a consequence of the existing ecosystem, not fundamental advantages of the cloud.
Nearly all enterprise level corporations are either already using private cloud services (citrix style solutions) with thin clients or are doing a migration to them for exactly the advantages you listed.
I think that what is for sure is that we will see this paradigm trickle down more and more throughout the workplace, with progressively smaller companies having deploying their own desktop visualization systems, with employees either using thin clients or bringing their personal laptops to work.