Funny you think there's going to be a party to vote for.
They already claimed to go scorched earth and do political purity tests for the federal government. I would not put it past them to label the Democratic party as a terrorist organization.
I know everyone wants to believe in this apocalypse, but that'd lead to a very obvious civil war, and despite Donald Trump claiming to not represent business interests, there's way too much money to be made by a stable America existing. So any hope you have of this somehow being the end, I just don't share it. The oligarchy marches on.
They control the most powerful military on the planet, with militarized police forces in their back pocket as well, and y'all qaeda to boot. Why the fuck would they have any fear of a 2nd civil war? An armed uprising would get squashed so fast, and Trump would probably nuke Chicago just for the cherry on top. They'll have their stability by crushing dissent.