If this box really is a secure, maintenance free computer, I see a lots of places where it could shine: elementary schools, small business, info kiosks, libraries, my parents ;-)
Small businesses (think store clerk, hotel lobby), for instance.
Alternatively as a mediacenter or server. I've used an Acer Revo for exactly this for the past two years now. The low power consumption maked it great for at-home development and hosting in my case.
I can think of some. A lot of people use browser almost exclusively at work. Salespeople, customer service people, etc. If the business software they use is web based, they use a browser.
I don't know, what if they need to edit a report with a company template someone made in Word? There are full fledged PC for sale at less than that price. Salespeople are often on the move and would probably use a netbook I think.
How do businesses currently share Word docs? They either email them around or put them in a shared folder. And when that happens, and the ChromeBox user clicks it, GMail or Google Drive will happily open that Word doc in Google Apps.
I may be mistaken but I don't remember being able to keep the template of a word document while editing it in google docs, changing examples anyway, slightly more complex excel files could also not be supported I think.
