Longer term you wouldn't have much choice at all...
If you hadn't transitioned your service within 18 months then your service would have been disconnected anyway as that is the requirement under the NBN.
I don't know what Telstra would be able to do as once the NBN is in the area they no longer have control over the network as it is transferred to NBN Co. My understanding is that they wouldn't be able to provide it the same way anymore.
That being said, it might be worth speaking to the Velocity/Smart Community team, and see as they might be able to as there will also be a lot of people with Foxtel via FTTH too - 1800 008 994