Why, you ask? Well, there are many factors. First, the NFL hasn't expanded since 2002, which is the longest time period without expansion since the 50's. Also, San Antonio is the seventh-largest city in the US, and the second-biggest city in the state of Texas. The two teams currently in the state of Texas, the Dallas Cowboys and the Houston Texans, had a combined 10-22 record last season. Dallas hasn't made the playoffs the last four years. That makes many football fans in Texas anxious for another team to root for, after much disappointment. Lastly, San Antonio already has an NFL-suitable stadium, the Alamodome. It has around 65,000 seats and only hosts one major football game a year: the Alamo Bowl. Already having an NFL-ready stadium would reduce the startup cost by at least $700 Million dollars, probably more.