Democracy is not a new concept, just current implementation is different. Democracy, in some form, dates back over 2500 years to ancient Athens (circa 5th century BCE). Around 1500 years ago (~500 CE), formal democracy as it existed in Athens had largely faded, particularly with the decline of the Roman Republic (509 BCE – 27 BCE), which had elements of representative governance.
It struggled with corruption, inequality and power struggles, so all the problems that are getting stronger with time in our democratic systems.
The idea of democracy reemerged during the Enlightenment (17th–18th centuries) and became formalized in modern political systems - United States (1776) and revolutionary France.
We live in cycles, democracy probably will fade again, and again it will be considered anarchic and unstable until the cycle repeats itself.