The best way to minimise the value of the NBN is to jerk it around and change direction; the next best way is to build it to a reduced specification. A 93% fibre network is worth a lot more than a network with 60% FTTN, both to a potential purchaser AND to an ongoing owner. The real economic promise of the NBN is the ubiquity of a single, uniform solution.
Oh for a politician with a little vision to see the possibilities!
(... and the gumption to leave the design and build to qualified and visionary engineers)