Earlier quoted context omitted.
The obvious question is will the US government allow one of its most profitable states to leave? Highly doubtful. Great way to start another civil war, though!
I think a red government will let a blue state leave (permanent electoral majority). I don't think the same would be true the other way around, because progressive values are more, shall we say, evangelical than those of the nationalists.
I think it's a good idea, and would probably move there if they did exit, but it's practically impossible for it to happen.