Partially I agree. This however will be of use to hobbyists who want the small and quiet, MythTV users for example or robotics hackers. Also those who have limited needs such as just an Internet "terminal" for example. Computerized home security. Local network web server (without monitor, keyboard or mouse). General all around "geek" toy.
This is small enough that it could be built into a keyboard and just plugged into a monitor thus minimizing the desktop space used up. (If you use a power brick rather than integrated PSU).
It likely will show up without people even knowing it. I read recently of a small unit in England that sits between your computer and the Internet and acts as firewall, virus scanner and spam scanner. The unit was actually a small computer running Linux. A unit such as this could be made to do that job and many others.