Come on Google, use an ARM processor, make it a dongle with a HDMI plug that attaches to the majority of cheap LCD displays, and price it at $99 or free with the first year (per seat) of a Google Apps Enterprise Account.
Now add a local ActiveDirectory proxy as a stadalone router-like box and hit Microsoft where it hurts. (Before Larry does).
No, no, that just makes too much sense to actually happen.
Add bluetooth to the dongle and add a wireless keyboard/mouse for $25
They already have a bluetooth keyboard and mouse set for the Chromebox, though I've not seen it priced yet.