Misleading. Small truck sales crashed during the economic collapse of 2008. Every manufacturer put firesale pricing on their full-size trucks to prop up sales. It's hard to move an old, low content small truck when the 1/2 ton sitting next to it with tons of options is the same price after incentives.
Small truck sales have rebounded, despite the lack of updates in the segment. For example, Nissan Frontier (last updated 2005) sales have increased 20% every year since 2009. Hell, even Ranger sales spiked from 55k to 71k in 2011 and that's a 13 year old design.