Why do we need NBN? Cable running on mt street gives extremely good speed for what we use unternrt for. Majority of it is streaming video or youtube. If you don't have cable in your area then you should expect to get cable or nbn.
Infact most of the streaming inly requires 5 mbps speed.
There is no immidate plans to bring the NBN to cherrybrook. As we have decent broadband and cable services. I know that the NBN is being rolled out to people that have lackluster internet. So by my guess, you could see it in the next 2 or so years after areas around it are completed.