Re: Well, you can see the attraction of it!
I suspect they're just hitting problems with carrier NAT. At some point even that doesn't help any more. If it was only 700 million devices they have to worry about then NAT might suffice but man + dog usually has more than one IP device and then they're all the embedded devices to worry about. China could reasonably claim to want to use all the possible addresses in IPv4. As could India.