Paul, you can still drop your bill less than a $100. You go with VOIP service so there would be no more copper line rental. Since you mentioned that your speed is good enough, then you will not have any trouble connecting to VOIP service. Most providers have VOIP service since it will be cheaper for the call rates and sometimes calling local and national calls are free.
I think the trial for fibre to the node had stalled. Most RSPs accept application for NBN Fibre service which is on a eligible location and once the FTTN, FTTH and FTTB are available they will just switch them over for free.