Where it would be really great is mobile. It would make voice and video apps so much better if users who trust each other could directly connect without the lat

Where it would be really great is mobile. It would make voice and video apps so much better if users who trust each other could directly connect without the latency adding rendezvous host. It would also need some sort of authenticated uPnP like protocol for telling the carrier when to allow traffic through their firewall though. I wouldn’t want random hosts to be able to waste my precious battery and bandwidth by sending unwanted traffic for my phone to process and discard.