You have a point about small centralized organizations being agile...yet that brings up another problem for them...they lack the manpower and the financial resources in most instances. Hence, any benefit they have in the form of agility is offset by the fact there are 4 people working for the company and they dont have a ton of money.

Look at Steemit...it employs 40 people now...a small organization to say the least....but the steem blockchain have more than one hundred thousand people contributing to it in various forms. While 40 people can make great strides, it is nothing compared to the 100K on here...some who are creating applications and back end stuff that most of us arent aware of.

As for the police and armies...did you really point to them? Governments are going to be decentralized also...the nation-state is going to be a concept in 50 years that will be laughable...at least based upon some geographic borders. We are already seeing the emergence of the digital nation with Estonia being the first. More will follow. So what use is an army when there isnt a geographic piece of land to defend...or a bankster system to start wars since they profit enormously?

As for the police, as everyone saw with the Parkland case, the police are under no obligation to defend anyone. This was validate by the US Supreme Court. So the police only protect and serve the interests of the state...protecting the interests of the community is optional.

As more of our economy is on the blockchain, enforcement isnt going to come from people or courts but the blockchain itself. This will reduce the need for the entities you describe.