> No, you don't. The biggest benefit to using IPv4 as the routing-infrastructure and extra bits (maybe an IP option) to describe the host is that most of the In

> No, you don't. The biggest benefit to using IPv4 as the routing-infrastructure and extra bits (maybe an IP option) to describe the host is that most of the Internet (routers, etc) don't need to get upgraded, only hosts. Routers don't normally mess with the packets so only the first/last wifi/switch actually need upgrading. This is a small number of devices (certainly much smaller than all!). What does WiFi or a switch even have to do with this?