The reasons I stated San Antonio are because Dallas and Houston are both over 3 hours drive away. Yes UT and and A&M, heck even Baylor is close. However, San Antonio did a very good job hosting New Orleans while they were displaced.
Also, San Antonio, being a military town has a lot of people from outside the area and from personal experience, I've not seen as much a die hard NFL fanship of any particular team. However, say one bad thing about the Spurs or Longhorns down there and prepare to be lynched.
Texas in general did not get hit as hard as other parts of the country during the recession, in fact job opportunities and disposable income improved for the most part during that time period so the area could economically afford to pick up a team. Compare that to southern Cal that has been on the downslope even prior to the recession and you'll see the economics of putting something in LA makes no sense.
Also we've seen in the past that Cal cannot support more than 3 teams. However, Texas, probably the biggest football state in the US, having only two and a growing populous would stand a better chance that possibly anywhere else in the US.
Are there downsides? Yes of course, San Antonio/Bexar county would definitely need to build a new stadium to host a club. The Alamodome can suffice for a while, but its overall capacity is too low. Land is pretty pricey so getting a new stadium built would be pretty expensive. SA is a pretty spread out town so mass transit is a bit lacking as well, which would force many more fans to have to drive to the stadium so parking is a must and traffic patterns would have to be adjusted.
All and all, its a large market that loves football and has shown the ability to support an NFL team which should make it an interesting choice.