Along with many groups Internet pioneer Vint Cerf has persistently warned of the imminent exhaustion of IPv4 Internet addresses (see clips from 2010, 2011 and 2012), to largely frustrating effect. The time for warnings is over.
"IPv6 adoption is currently perceived as all cost and no value. So organisations are maximising the remaining elbow room in the current IPv4 environment, by, for example, squeezing more out of Network Address Translation (NAT) which allows a network to use minimal addresses, or by renumbering redundant addresses, or by other means such as deploying private networks.
And when it comes to the Internet of Things there is a chorus from some technical but influential people in organisations actively urging restraint on IPv6 adoption.They see IPv6 as a Layer 3 network issue, not an Internet of Things issue. One argument is that IPv6 is just one element towards interoperability in an Internet of Things environment and not the be-all and end-all. It points to inherent dangers in equating IPv6 with getting value from the Internet of Things saying, for example, that the thousands of sensor devices around a hub don't necessarily need IPv6. It is only the hub itself that does."
-- Dr John Riley