> Possible further benefit, reaching India and China who certainly aren't issuing IPv4.
This is important for servers, but not so much for consumers, IMHO. Sites in India and China are highly likely to be dual stacked, so v4 only users aren't likely to be missing any content at least currently. Although certainly missing access to v6 preferred peers. There's very few really v6only use cases out there yet, almost every consumer access network has some way to get to v4, there's too much v4 only content not to; even if the v4 access is much worse than v6, as it sometimes is.
This is important for servers, but not so much for consumers, IMHO. Sites in India and China are highly likely to be dual stacked, so v4 only users aren't likely to be missing any content at least currently. Although certainly missing access to v6 preferred peers. There's very few really v6only use cases out there yet, almost every consumer access network has some way to get to v4, there's too much v4 only content not to; even if the v4 access is much worse than v6, as it sometimes is.