I think the next version of IP needs to be anonymous. That is if I connect to multiple endpoints they should not be able to know that I am the same person. It may even be a good idea to allow multiple connections to the same host to be impossible to relate together, but that has some negative connotations for DoS attacks. Right now there are a myriad of problems based around the fact that sharing IP addresses is becoming frowned upon. It is a serious threat to any P2P and even just the ability to follow links without fear (for example asks you to confirm every link you click to prevent IP leak + DoS attack).