Re: What should have happened with IPv6
This is what many mobile networks have already done as they control so much of the configuration (especially routerS) and would otherwise have to pay more for the addresses. But, otherwise, ISPs counter by saying that as there is no need nor requirement for them to do so and it costs money to change, they won't do it yet.
This could be fixed easily by national regulators… But that would also have involved forcing operating systems and consumer hardware to do IPv6 properly, which was unlikely to happen due the fact that the US still has more than enough IPv4 addresses.
As it stands 24% of all network traffic is very impressive compared to a few years ago. A breakdown by region and mobile or fixed line would probably also show that some countries are pretty much IPv6 already.