My understanding is that currently people set up a STUN/TURN server to relay WebRTC, so it's not really used as P2P but there is still some benefit to the protocol itself.

To move to true P2P for WebRTC seems impossible, as even if 80% of web users were on IPv6 without NAT (and even 80% seems a bit hopeless at this point considering we've been transitioning to IPv6 for 20 years now), you'd still need a fallback configuration for the 20% that don't. There doesn't seem to be a feasible gradual transition strategy.

This is not really my area of expertise, so I'd love to be proven wrong.