Ya, they're clearly not at rock bottom. I don't know what it would take to break through their cognitive dissonance and I don't see anything happening anytime soon to change things around.
a couple things:
1. as of april 2018 trump has an 85% approval rating with evangelical voters and 65-75% approval with republicans in general.
you need to understand that when it comes to people who are religious, nothing happening in the world or the administration matters, because religious thought is based on having a conclusion and then ignoring or vilifying anything that contradicts that conclusion.
"trump is a good president who will make america great again" is the conclusion, anything that goes against that conclusion is a lie or a distortion.
2. "they" don't have a "rock bottom" in the sense that the rest of us do, because you have to remember part of the foundation of conservative "logic" which is that no matter who you are or what your circumstances may be, you're actually a rich person who just doesn't have their money yet.
poverty stricken republican voters don't think, they KNOW, that they are one gas station scratch ticket away from being millionaires, or that the movie "brewster's millions" is a documentary and is about to happen to them, or they're going to make it big with their "mustard bottle that is also a flashlight" idea... by whatever insane method, the point is that every single poor ass republican voter is utterly convinced that any minute now they're about to be rich.
this is why they hate taxes and social safety nets, and why they vote against their own economic interests: because they think they're actually rich people, and since christian moral thinking is predicated on "fuck you, i got mine" and keeping down everyone else, they need to limit human decency in government in order to further their own ego.
3. trump was, and still is, a physical manifestation of everything that conservative american politics has stood for over the last 40 years. there couldn't be a more perfect encapsulation of the republican party if god his own self came down from the sky and carved it out of clay and breathed it to life.
liberals need to stop with this delusional that trump is an evil that everyone will see sooner or later - he's the best thing that ever happened in the minds of a huge number of americans, and there will never be this great awakening where suddenly people see him as a scandal riddled dipshit, because a scandal riddled dipshit is their ideal of what a perfect president is.