It would be nice to see RSS come back and replace some of the centralized web. In theory social networks could be replaced by event feeds your friends publish. If you use something like IPFS you could, in theory, have a fully decentralized social network.

There's still some business benefit to hosting, scraping, providing search etc. The business models are closer to the open web.

I'm sure there's flaws and challenges in the idea. Even if private posts were encrypted you'd still leak some info publicly. Still I think its a neat idea.