Consumers don't want faster speeds
The reality is that customers simply aren't prepared to pay for faster speeds. Every iteration of the NBNCo Corporate Plan (both Labor & LIberal) has predicted the most popular speed will be 12Mbps. The actual take-up figures published by NBNCo in July proved that consumers aren't prepared to pay with 35% on fibre connecting at 12Mbps and 42% connecting at 25Mbps.
Labor's grand stupidity in introducing speed tiers on fibre has effectively crippled the network and meant that there is little difference for most people between the various technologies.