Re: "Nobody uses it..."
I think you mean that we need another octet at the beginning of the IPv4 address.
That's as unlikely as IPv6 ever being widely implemented.
If you consider the port number part of the IPv4 address (which it really is) and less use of port numbers by HTML5 etc., there is no shortage of IPv4 addresses from now until infinity. Sure it's messier than a clean new system, but IPv6 is hardly a clean system, and hardly new.