If anything, it might be a blessing to the other states, that they are not connected to Texas at present. Consider the northeast blackout of 2003:
https://www.scientificamerican.com/article/2003-blackout-fiv...
Texas is not shutting down train lines in Canada. We didn't implement our own winterization guidelines and now we face the consequences. That's how it should be.
The justification for Texas's grid goes back many decades and can't be assessed on the basis of an event like this -- that's recency bias.