Mailbird makes use of WebRTC by simply using Chromium as its foundation. It enabled it to partner to get the services it needs done faster. See what Andrea Loubier, CEO of Mailbird has to say about their service and WebRTC.
WebRTC gains a lot more than just being available on Chrome and on Android. These two open projects mean that WebRTC gets adopted in many non obvious places. Call it the unintended consequences of having Google bring WebRTC to life.
Radio is an interesting use case for WebRTC P2P CDN. It can benefit from longer sessions and enhanced capacity by utilizing WebRTC. Here is what this can mean to broadcasters who wish to try out this technology.
Google just announced their intent to make QUIC an IEFT standard. QUIC also has a role to play in WebRTC by replacing SCTP. QUIC brings with it faster connection times as well as better congestion algorithms.