Personally, if all the features we needed were available on a Chromebook, I'd recommend we move to them for our entire company where I work in IT.
We're currently migrating to Google Apps - which I've been using for my own personal business for quite some time. I see us leveraging more and more of the features in the coming months and years as our workforce becomes more and more familiar with what's available within Google Apps.
Sure, there are some things that we can't do on them yet - but as more and more of our products move to a web interface, I see these as being a possibility for more and more of our employees. In the end, if they put a remote desktop client on these, I can see them using a Chomebook for most of their work, and a virtual machine for anything that's not supported. The only problem is a lot of the larger businesses are only writing their products to run on Internet Explorer. I'm hoping that changes in the near future where these apps are supported on other browsers.
As for the government, I'm not sure it would provide the savings suggested since the change of them outsourcing all their storage to someone else could be an issue. I do see some movement in this direction since the OMB just approved Google Apps - but time will tell.