The best replacement for nbn is adsl2+.

The best alternatives to nbn are rated as following:
★★★★★  adsl2+
★★★★★  4g
★★★★  google fiber
★★★  telstra
★★★  opticomm
★★  ftth
★★  coalition
★  fttn

Your alternative for nbn is not listed? Suggest!
Speaking about nbn, one probably shouldn't forget about telstra.

Other search terms related to nbn and their ratings are:
★★★★★ telstra
★★★★ tpg
★★ phone line
You have in mind a companion for nbn and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of nbn in all years. Click on graph for more.
nbn
adsl2+
4g