Sports Business Daily has the television ratings for every NFL team from 2011-2013, and you probably won't be surprised to learn that being the worst team in the NFL did not result in ratings growth for your Houston Texans in the Houston area.
The Texans saw a 12% drop in ratings in 2013 from where they were in 2012. Curiously, their 2013 ratings are about the same as they were in 2011; you'd think the team's first division title and playoff berth would have garnered higher interest locally.
Take a look at the Saints' television numbers in New Orleans. Wow.