Is the NBN just a sort of "fill in" for 5g ?

Telstra & Errickson have developed 5g to a useable level which needs refining. It will be available to the general public when it is refined more and seems to be lots faster than the NBN so will the NBN still exist with competition in 2020 ?

This week the US operator Sprint announced that they are trialing their Magic boxes on drones. Here is a video on that:
Back in August, IEEE Spectrum ran an article on how Flying Cell Towers Could Aid Search and Rescue. Base stations carried by drones would form an ad hoc network and connect first responders.

From the IEEE Spectrum article:

An aerial communications system supported by drones could be deployed much faster and operate with minimal interference. In 2013, we started to think about what such a drone-based communications system for public safety agencies might look like. We knew it would need a shared radio-frequency channel for first responders, drone-portable base stations, a power supply, and a digital database for exchanging information. We would also need controllers that would be easy enough for a licensed drone pilot to operate in a crisis.

Our first major challenge was to find a base station small enough for a drone to support. Drones under 25 kilograms—the limit now imposed by U.S. air-safety regulators—can carry a maximum payload of about 2 kg, so we would need a base station that weighed less, even with