People, ISPs, etc. will move to the 128-bit Internet when they're forced to and no sooner. The fact that there is a workable solution to a known problem both proposed and implemented means that the transition will be less painful that it would be if there was no alternative and people are forced to "go digital or else".
It is a credit to the IETF that a multi-decadal design still functions amazingly well and no dictatorial edict requires that all unilaterally relinquish all the perceived advantages of IPv4 until there is consensus and need to do so. Survival of the fittest!
Regards,
Gary (sent from an IPv4 IP, sorry...)