The larger question Google is going to have to answer is "What advantage does Chrome offer over Android?" If you take a netbook/notebook and load android on it you can have everything Chrome offers by avoiding any application other than the web browser OR install local applications. So why will an OEM or customer chose Chrome?
For that matter you can load Ubuntu on the same machine and the same argument basically holds, if you are afraid of keeping local info, just launch the browser full screen and have done with it... while keeping the OPTION of local applications or content if you ever need it. The example of a convention center with dodgy wireless being a perfect one.
Yes in theory a Chrome OS only unit can save some by leaving out local storage but unless a lot of people want Chrome in the worst sort of way the iron laws of economics and monopoly will keep the basic Windows 7 notebook less expensive and more available at retail.
So any Google peeps want to enlighten us as to just what the sales pitch is intended to be?