I honestly believe Texas wouldn’t last more than a few years without begging for someone, anyone to help them.
They aren’t a self-sufficient state, no matter how much they pretend to be. They need a massive influx of goods that would all immediately halt or be indefinitely postponed (and massively marked up) if they broke off.
The real question is whether the treasonous MAGAt politicians who run the state would make a deal with Russia for assistance.