I completely agree with you on that one. Coverage needs to be really improved before CDMA voice gets shut down. Density and coverage have to be improved upon as is quality and reliability. When those things can be improved upon within their own footprint and then expand upon it to where it needs to be expanded upon then that will be the right time to launch volte for the general consumer.
They (Verizon) will not activate CDMA only devices after July 1, 2018. They will shutdown their CDMA network to consumer devices on Dec 31st 2019 but will keep their CDMA network available for M2M customers until 2022. So Sprint customers have until then to roam on them.