The market for chromebooks IMHO is corporate customers. Organisations that are investing in thin clients for their staff could get chromeboxes for a similar price and discard a load of windows terminal servers. Places like hotels or libraries that provide public web access terminals would do better with them than locked down Windows boxes too.
I don't see them being so popular in the home. A desktop machine and a chromebook is way more functional, as you can use the desktop machine as a server.