I don't support the idea, but I do think that there could be hypothetical reasons why a state should be allow to secede.
I could learn to like an independent Louisiana if we were recognized and on good terms with the US. We'd have our 12-mile territorial waters and the exclusive economic zone. Then there's the wells on land, all our pipelines, refineries and other petroleum plants, plus Access to the Mississippi and the Intracoastal Canal. I think we could potentially do okay as far as business goes.
It all hinges on a not just peaceful, but friendly split. It wouldn't happen for many, many reasons. Still, it's not a nightmare.