> Once IPv6 routers can be configured to do selective ingress as easily as IPv4 routers,
The interface of IPv4 routers has generally been horrible. It doesn't matter because you don't even have a choice; you need the default setting = NAT enabled. Consumers must find their IPv4 routers very easy to use indeed since most they don't have to use them at all. Even gamers don't have to any more since UPnP. The vast majority has no idea what a NAT is and does not need to know.
So yes: IPv6 is a new problem in a way because now you do have the choice of filtering versus not. A good problem/checkbox to have. Giving people this checkbox is exactly what IPv6 is all about.