Is democracy our political zenith for political and social stratification or will it eventually die out like other systems did? This may seem like an overreach today but it certainly appears like an increasing possibility in the future from my perspective.
Modern democracy is perhaps now reaching it's normalization/maturation stage, especially in western nations - that it has begun to show more than a few cracks on the way.
Amongst the most bothersome for me is the polarization among distinct ideological groups and their strong refusal to seek a middle ground.
The election of Trump for instance was widely marred with protests despite the supremacy of the Democratic institution on which he was elected. That shows that more than a few were willing to subtend their respect for rule of law just to have their way.
The build up to an election process is not in any way better - often involving bitter rows, blackmails, and an invisible financial cabal pulling strings behind the scenes; making current democratic practices both expensive and morally suspicious.
With an increasing globalized world my guess is that it will become increasingly ethnocentric, causing serious questions about its sustainability in the long run.