I concur, page-49

Initially 5G will be rolled out on existing mobile phone towers. It will use the 3.6GHz band in Australia. Improvements in antenna technology and beam forming means a 5G cell is expected to cover the same area as an existing 1800MHz 4G Cell despite the shorter wavelength
Due to the improved spectral efficiency of 5G the cost per bit could be 10% of 4G

Some 28GHz 5G will be deployed in high traffic areas such as shopping malls, main streets within the CBD, Sports stadiums etc... This is the short range stuff, but the costs of the microcells could be below $5000 installed once its done at scale. Microcells can cost carriers less than US$1000 for hardware alone. As bandwidth needs increase 5G will be rolled out further

Legislation is already changing so you can put microcells on lamp posts with few approvals, and much of TPG's deployment in the CBD in Melbourne and Sydney is on light posts. NBNCo has also applied to the government to allow mobile backhaul over NBN Fibre.

It would make sense that heavy data users should remain on NBN...
However maybe 1/3 of the population could be candidates to replace the ADSL or 12/1 NBN Service they have now with a 4G/5G solution at maybe $10-20 per month less