I'd argue that the greater risk of things falling apart is economic rather than political. We've built our society on two near-ponzi schemes that are in danger of falling apart. The first is pension funds which are paid into by current workers to pay out for past workers. Pension funds inherently depend on population growth to avoid shortfalls. They rely on the fact that more people pay into them then take out from t…
This doesn't need to be a ponzi scheme though. Even if population size is stable, if people on average work longer than they are retired, they have to pay less than they receive, all things equal. A problem here has been that people get increasingly older, so they spend a larger percentage of their life being retired, making the ratio of payers vs. receivers worse. The most obvious solution to this is raising the age of retirement, but that's always politically difficult and somehow seen as cruel.