Peaceful? It sure wasn't peaceful the last time. What state's government has the resources to defend itself from the Feds?
And, even if the Feds didn't want to fight about it, what would stop the Feds from just selling the state to a foreign country? Do you think that Obama might be willing to sell Texas to the Chinese if he had an excuse?
Think about that. Seriously. Obama's capable of just about anything.
Yes, it can be peaceful. In the end, maybe not.
Unfortunately, this is never even considered as a lawful option. Barely a whisper.