Working people generate nearly twice what their families consume. Producing isn't a zero sum game for food, jobs, or anything else!
Water can be an issue, but with careful planning for the growth, they can support about 10 times the current TX population on their current water.
The real question is: Does Texas have room to store the equipment for the 90% or more of the US military that would rather serve a free state than a tyrant?
Ft Hood.