I don't believe this will actually happen, nor do I want to see it happen. I want to correct the problems, not run away from them.
I will say that Texas has enough strengths to talk about this, even if it is not a "real" proposal to most people. I think it adds to the incentive to fix the problems, as this is a possible if not probable outcome otherwise.
I agree with your comments there, and as long as Texas can take a pass on attracting more illegal aliens to the state, there will be time later.
If it does attract them, it may be difficult to extract later.