IPV6: Adoption driven by smartphones?

Horace Dediu of asymco charts commodity computing up-take (as yearly sales) since 1975 in  "The evolution of the computing value chain". It includes personal computers, smartphones and more.

Current PC (desktop+laptop) and Android sales are about equal at 350MM/year, with iPhones ~150MM/year and iPads closing in on 100MM/year: or near 1Bn new personal compute devices per year.

With current growth rates, how soon will we saturate the IPV4 address space?