fwiw 2km is probably good for 10 megabit.

Thanks, that's what I was after. That will be fast enough for me.

Does anyone know what the long term prospects for connections like this to get upgraded? I am guessing UFB is probably 10+ years away for Alexandra (if ever) but would there be some newer VDSL or the like to bring connections up to the 20-30Mbit mark?

If its around 2KM from exchange itself i wouldnt see much in the near future ans the FTTN rollout for urban areas has pretty much stopped.