Sure, why not. It would make things more interesting for a while. I don't think it would last for any state, but it would stir things up in the news for a little bit. It would probably just devolve into negotiations and the state agreeing to rejoin, but I see nothing wrong with it. America was founded on secession. Many of the founders essentially endorsed much more violent forms of rebellion so I don't see it really contravening American principles.