Q3 2013 is a long time ago. According to NPD, Chromebooks had 14% market share in 2014, counting retail and commercial (read: education) channels. Growth was up 85% year over year, too, which is amazing in the context of a stagnant/declining laptop market.
You can spin it all sorts of ways. Keep in mind the 'PC' market includes all those legacy Windows XP computers which are languishing in peoples homes, businesses, corporations, etc...
Chromebook sales are a much bigger part of current PC sales. And vendors do keep expanding their Chromebook lines. If it was a failure they wouldn't.
http://betanews.com/2015/02/24/2015-is-year-of-the-chromeboo...