Imo they should have kept the ipv4 format but instead of maxing out at 255.255.255.255 make it 65535.65535.65535.65535 this aproach makes the address pool more than 4000000000 times larger and is backward compatible with ipv4 so it could be a drop in replacement for most things. And if we ever do end up running out of over quintilion (18000000000000000000) ips we can just keep going up, to 4294967295.4294967295.4294967295.4294967295.