George, I don’t know what your broadband services (e.g. DSL, cable, etc.) are like where you are, but here in Australia you always need some kind of terminal adapter equivalent, e.g. the DSL modem, the cable modem, to handle the PPPoE or analogous session oriented protocol over the wide area link.
The point is that these home gateway devices do that on behalf of all the other devices in the home. They still do that, and act as a router, even if using IPv6. They’ll still want to provide a controllable firewall, even with IPv6, and all the other features. It is only NAT / NPAT that they are dropping.