The Chromebook - Google's version of a notebook that uses the browser as the OS. There is no desktop, no antivirus, no installation of software (web apps), and no annoyingly-long boot times. All of this sounds great, but what if I do need an offline app? As an example, Google Docs works great, but sometimes I need that bit of extra formatting (merging rows in a table) and this is only found in offline office suites such as LibreOffice. Also, computer intensive tasks requiring photo and video editing can be done online, but it's extremely slow and limited (editing photos in Picknik).
Currently, I think the Chromebook will work as a great secondary device. It is built for the web, and it does a great job with it. It will eventually fall into the primary device category, the web hasn't evolved enough to put it there yet.
So my answer to the title of this post is .....maybe.