geez, let it go. They need a different approach with this.
First of all, stadiums have already been built in the past (Alamodome, Wolfe Stadium, Toyota soccer) and they have the results right in front of their faces. Were they economic generators? No; in San Antonio that has not happened. The closest was when the Spurs played at the Alamodome. A few small businesses opened in the Sunset Station area, but that was it.
It has nothing to do with the stadium. There are only a limited number of games in a year and that will not support a business for the year. Extra traffic on game days can be the big days for certain businesses, but that's it. Positive economic impact is more related to the location and its potential. Sports can be part of the experience. And, if they are looking for what makes sense sports-wise, then they should compare the enthusiasm for soccer as well.
If San Antonio wants to be part of MLS, then they need to locate the playing field in a desirable area. The location of Toyota field was a mistake. It can work for minor league, but narrow thinking that wound up putting the at&t center where it is now is not going to be seen as advantage when the league considers who should be awarded a franchise. And, I think if they compare minor league baseball to major league soccer it will show that they should consider the latter first.
I would be curious to see the attendance figures, ticket price comparisons, payrolls, etc. If they feel compelled to go down this path then look at the BIG picture.
Personally, there is so much more to plan for infrastructure-wise in downtown that a sports stadium is just a distraction that SA can't seem to get past