Nope, spec just doesn't mandate that UDP is a required channel.
I mean fundamentally the goals of WebRTC and game engines just aren't that well aligned. All games are going to want an authoritative server to hold the master state and reconcile clients. Where as WebRTC is very much interesting in P2P. All the STUN, TURN and ICE stuff is pretty much wasted on a game server.
The spec is also way over complicated, heck it covers DTMF for crying out loud.
I mean fundamentally the goals of WebRTC and game engines just aren't that well aligned. All games are going to want an authoritative server to hold the master state and reconcile clients. Where as WebRTC is very much interesting in P2P. All the STUN, TURN and ICE stuff is pretty much wasted on a game server.
The spec is also way over complicated, heck it covers DTMF for crying out loud.