They aren't quite killer applications though, so it won't push many to IPv6. Possibly as the internet gets larger, some hosting providers simply won't have any free IPv4 addresses left? I guess that could be solved by putting CloudFlare in front of the server to provide an IPv4 address. It's strange, I used to do that to provide IPv6 years ago.
So there'd be no: "I want this IPv6" calls to the ISP.
I suppose that you could add a long artificial delay to the IPv4 service.