Though I wouldn't completely rule it out as I'm sure it can be worked around, I don't see the need to deal with the potential issues when you have other good viable options. Extremely close to Mexico you have the rapidly expanding Austin/San Antonio market with only one other pro franchise. Throw in Montreal, Charlotte, Portland and you have plenty of options. There's also no teams between Atlanta and Dallas further south than what St Louis/Cinncy. Something there could work, like Little Rock, Memphis, Nashville, New Orleans. Though I think Charlotte would still be better in the general southeast region.