You're at once giving them too much and too little credit, while it's unusual to see a midterm result like this, it doesn't (for now at least) appear to have ended Trumpism in the GOP. Ended Trump perhaps, but that's not the same thing. And honestly, I sincerely doubt they'd have managed to get anything done except propaganda without the presidency anyways. As it is, as sad as it sounds, we're going to have to keep voting ad nauseum against this nonsense until people drop the whole attacks on democracy idea.

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On the plus side, the participation is an implicit endorsement of American democracy though. In a lot of ways this is a sort of 'social trust' issue. Democracy is basically just people willing to work through the system, which requires expecting the system to be at least minimally above the board.