With all these devices coming up, it is inevitable that we will transit to IPv6 soon. We have been on the IPv6 network for quite a few years now thanks to academic connections and networks. First we had IPv6 ove IPv4 and later got into IPv6 directly when the means and equipment were available.
But now Cisco is introducing new carrier-grade IPv6 capabilities to the Cisco CRS-1 Carrier Routing System for the network core and to the Cisco Aggregation Services Routers for the network edge. So I am sure you do not need to scramble like we did when we deployed IPv6.