> If the web was already built with content-addressing in mind, my machine could automatically fetch the content from another machine on my network, my neighbor

> If the web was already built with content-addressing in mind, my machine could automatically fetch the content from another machine on my network, my neighbor, a dynamic cache at the ISP or wherever, anyone could serve me that data instead of that particular node with that particular IP on the other side of the world. I don't think the lack of content-addressing is the main thing holding this "utopia" back. The bigger problem is designing P2P communication protocols that work efficiently, utilize bandwidtch fairly, are not easily attackable, do not accidentally cost peers excessive amounts of money and so on. If your neighbor is on a metered connection, I'm sure they are happy the web is not using their machine to serve you content. Even if they are not, if connections are spotty and bandwidth limited, they may not be happy if their YouTube video starts stuttering because their system is now serving you Netflix content. And when they're watching porn, they're probably happy that someone else can't easily find out which porn movie they are watching by polling nearby peers for a content hash. Ultimately the client-server model has major advantages over peer-to-peer that are highly ingrained in our society. It is the model by which delivery has almost always worked, way before the internet.