It will be slow, then all the sudden. Meanwhile it will keep getting more illiberal for a larger and larger % of population. Used to be it was just poor blacks and poor hispanics, now it is also poor whites and bigger chunk of black and hispanic population. The trend is unmistakable and only matter of time until it would have reached my socioeconomic status.
I lived through the fall of USSR, I see a lot of parallels now. 90s were really awful time to live in post-soviet republics, but "nobody died" and the world didn't end. Likewise with US, unless somebody presses the red button on the way out.