IPV6 is already rolled out in parts of the world. My provider has a Dual Stack lite architecture, the home connection is over IPV6, IPV4 is normally being tunneled via V6 through a provider grade NAT.
As I AM a network nerd, I pay for a dedicated IPV4 address every month, so I can reach my stuff from outside from old IPV4 only networks.
So when I plug in my router, connect a windows machine and just google stuff then all this traffic will be IPV6 without me configuring anything.
It's so great fun having the attack surface being doubled by dual stack setups.
Because behind the carrier grade NAT I don't get a routable IPV4 at all, so no inbound connections.
With the IPV4 I use I do use dyndns now, so I can resolve it from outside.