I'm a sanguine personality and perhaps more sanguine than other conservatives on this topic. Whether I am looking through rose-colored glasses remains to be seen.
The main reason for my optimism comes in looking for the obstacles to the Marxists on the coasts and other places going where the Marxists before them have gone. Let's take California as an example. An entirely captured state, with some enclaves of sanity, but controlled by Cabe's "Demarxists". But it is a mess because leftist ideas never work anywhere they are tried. At some point the free stuff stops coming and all the people are left with is unlivable conditions. When that occurs, a political solution will be available for Californians to change course. So, I'm willing to let that play out.
All other Marxist experiments begin with popular support, utopian language of justice and equality, and when the cost of its lies and its practical failures become obvious, then there is a brutal crackdown on dissenters, freedoms are usurped, the gulags and re-education camps open, and force is exerted to maintain the system. All of that is illegal and unconstitutional - they can't do it. If they do, it means that we are already in a civil war and the possibility of a diplomatic divorce is long gone. As long as the Californias of the country are part of the United States, they do not have the option of coercion that every other Marxist system has needed to remain in control. I have to believe that even libs in those states have a limit on how much misery they can take and how much BS they will swallow before they do a political correction. That's why I'm cautiously sanguine.