Given any group of people and a certain task, the group will organize itself.
Almost always with a leader.

This i have seen everywhere.
The only place it doesn't is with a group of competent people who all have a very strict/structured tasks.
Such as plumber, electrician, framer... on a job site.

So, given this, when we have created larger groups, we tend to fall into the mode of electing a leader.

Unfortunately, those who would be good at leading want to do almost anything else but be a bureaucrat.
And even worse, those who want power are attracted to those positions.

In the future, i believe we will see the governing structures be applied to no more than a thousand people.
And the structure of structures won't have any authority. They will be guides, councils, or leaders for a certain project.

And the most important aspect is, if you do not wish to live under the ruling of the group you find yourself born into, you can choose to leave. The biggest problem we have today is that there is no place to leave to.