Someone will probably roll something like this out in the metro areas and it will eat the NBN
You can already order microwave and fixed fiber links in Sydney CBD, Pyrmont, etc but they cost a lot more than $60/m.
The NBN was a solid idea. Execution is always kind of the issue though.
:( such a sad truth.
I recall someone complaining that they had no internet at all for months, because the NBN wire got hooked up to their house, but not plugged into anything at the other end - then their internet company was legally obliged to disconnect their DSL because technically they had an NBN cable - it just wasn't plugged in to anything.
Of course this would be a good law IF we were getting proper fibre NBN (and the above technicality got seen to). Just like we don't want multiple companies running power lines to one house.
This does not preclude other high-speed internet options servicing those dwellings.
For example, https://www.lightningbroadband.com.au offers or plans to offer 100/100 (actually, some pages have mentioned 200/200 but maybe that's coming later or business only). A salesperson explicitly told me they plan to service NBN-connected areas too but that they'll probably prioritise other non-NBN metro areas first, because the demand will be stronger.