The two things I gleaned from “The Decline and Fall of the Roman Empire” were (1) the decline took a very long time, and (2) very few recognized the decline as Rome was declining.
I am always amazed at dystopian writers. If I truly believed that western democracy will be soon heading for something much worse, I would be spending my last savings drinking margaritas on a beach somewhere before my bank account got confiscated.
However, I do believe that western democracies in a slow decline. The USA is already seeing a reduction in various “happiness” parameters. And I believe we can reverse this decline not by trying to fix the current system, but by starting to build a new system.