I think the biggest problem is the lack of accounts, chat, logging, and persistence in webrtc. Thats what keeps it from being a p2p communication protocol in general whereas now its just a toy for video calls.
I mean, when you cannot share links during your video call easily, somethings wrong.
Sharing links, accounts, chat, logging and persistence are all irrelevant for my use, and they in any case don't belong in webrtc - webrtc is a component for people to use to build services like what you appear to want.
WebRTC is not a messaging technology, it is a raw data communication technology. It is just here to move bytes from one client to another. The features you are talking about are managed by said clients, meaning that it has to be handled by Firefox/Chrome itself.