I don’t think the hard part is getting people on board with it. The hard part is just getting a vote on it.
EDIT to address your point: I think if enough people want it, it will happen. The Civil War was about slavery, no matter what some folks will say. The current direction isn’t towards war, it’s towards an indifference followed by dissolution. There’s no energy to keep Florida or Texas or California from leaving if that’s what a large majority want.