There is no technology possible that removes said responsibility. This is how peer to peer systems work. Your criticism is something that no peer to peer system claims to solve.
> Information flow in Freenet is different from networks like eMule or BitTorrent; in Freenet:
> 1. A user wishing to share a file or update a freesite "inserts" the file "to the network" > 2. After "insertion" is finished, the publishing node is free to shut down, because the file is stored in the network. It will remain available for other users whether or not the original publishing node is online. No single node is responsible for the content; instead, it is replicated to many different nodes.
The reason this works is it costs some amount to initially print the data to the network, limiting that kind of abuse.
Once the monetary reasons drop then so does the data.
And surely you're not saying centralized hosting being a strict requirement was what people had in mind for P2P?