I think having peer to peer connection modules could be used for doing a lot of interesting things. I would like to use p2p modules to build an online charades game that people play over their webcams. The database widget I proposed here (#134) could be used to build the game's lobby and mediate connections.
I started a $10 bounty on this issue here: https://www.bountysource.com/issues/1030307-module-request-a-web-rtc-peer-to-peer-connection-widget