I think the majority of Democrats and Republicans want and care about the US continuing to be a Democracy. Both groups of people are afraid of a dictator, and still hold Democracy as one of their values.
If the Republicans win they will probably try to further chip away at voting rights and some other things that make us nervous, but I do have faith that the US constitution, and even our Justices in the Supreme Court won’t do anything so completely insane that it completely alters the country.
If they chip away at voting and checks and balances Democrats need to get better at getting out the vote.