Re: 30 second ipv4 redesign?
" I've spent no more than 30 seconds thinking about that so sorry if I'm oversimplifying it."
With ipv6 overland on ipv4, you'd have the situation of IPv6 hosts being able to send packets to IPv4 hosts but a very slim chance of IPv4 hosts being able to return them without some kind of translation in the middle.
There has to be a gateway (or gateways) somewhere, which means you may as well just make it dual stack, transition to IPv6 and then discard IPv4
There's more IPv6 traffic now than there was IPv4 a decade ago and the majority of the traffic in/out of my home network is now IPv6. We're pretty much at tipping point and all those valuable IPv4 addresses will be useless eventually.