"Democracy" will exist (as an idea) for a long time. What's currently happening in a lot of countries is that entrenched powers are actively disrupting the use

"Democracy" will exist (as an idea) for a long time. What's currently happening in a lot of countries is that entrenched powers are actively disrupting the use of democracy in those countries, and some subsets of the populations of those countries are also losing trust in it as a useful system. Even this "decay" isn't inherently "bad" (assuming you are pro-democracy). There are numerous other decision mechanisms, and many of them are inclusive and transparent. Some of them might work for various levels of civil organisation, should The People want to give them a try. If a country replaced its democratic voting system with one of these others, you could still call that a "decay of democracy", but it might actually be good for the country. (For the record, I don't think authoritarianism and its associated decision systems are good for large, general purpose bodies like countries.)