They both miss the point
These two commentators both seem to miss the point here. The NBN is being built as a government-subsidised open network to break the current monopoly. The Howard government created a monster of a fixed-line monopoly when they privatised Telstra, the company that owns the only copper network and the largest of the HFC networks.
Keeping rural access costs equivalent to metro costs is important, as allowing the market to determine rates would cause the NBN to be inaccessable to at least 10% of the population due to cost. It is nearly impossible to get any internet service other than Telstra ADSL or 3G outside of regional centres, and competition can only exist if it is cost-competitive.
Telstra's HFC network currently only covers metro areas that generally have access to ADSL2 and/or the Optus HFC anyway, and being a closed network, is not of any use to anyone other than Telstra or Foxtel. I don't imagine than with the NBN rollout, there would be any telco who would want a redundant HFC network and its associated cost; requiring Telstra to shut it down just ensures that their monopoly on fixed lines is broken, and there is no needless duplication.
The NBN should be something of pride to Australians, enabling everyone equal access to the internet and reflecting our egalitarian values. Leaving something as important as telecommunication to private business has enabled some great innovations, but by allowing the government to build national infrastructure such as this, can allow freer access to all.