I think it is time to move to the next level of IPv6 deployment.
Ideally the IETF WiFi network should now only provide the following 2 networks:
1)IPv6-only
2)IPv6-only with NAT64
The later should be the default network.
However you would say, well some stuff will break, some non technical people will use the IETF network and may have a bad experience, etc...
So to be conservative but at the same time futurist and like it was done a few years back, why not create again an IPv4 outage of a few hours where the above 2 networks would be the only networks available?
Depending on results, this outage could be expanded to a full day at the following meeting, until the IPv4 network is totally removed from the WiFi?