There are so many definitions for efficiency, so cannot comment on your number of 70%
In any case, there is a strong possibility that the next 1X generation will be conventional floating gate with wrap around IPD and only after that 3D NAND will come.
Drones are, in essence, flying autonomous vehicles. Pros and cons surrounding drones today might well foreshadow the debate over the development of self-driving cars. In the context of a strongly regulated aviation industry, "self-flying" drones pose a fresh challenge. How safe is it to fly drones in different environments? Should drones be required for visual line of sight – as are piloted airplanes? Join EE Times' Junko Yoshida as she moderates a panel of drone experts.