That's a good question and I can make some analogies with the blockchain. That's a system without leaders, without a central control and authority, and it works great. Is it possible to replace the world leaders with some codes and algorithms that will make smarter decisions? I think yes, taking into account how stupid some of them really are. Imagine, that Putin was a robot controlled by all Russians (only Russians, because he represents Russia). He would follow the decisions most of the 'Putin blockchain' members would agree upon. That would be really a democratic Putin, wouldn't that? He would not take decisions that would only promote his image and business interests. 

The same applies to other world leaders! Don't you agree?