We won't be able to afford NBN

I am not at all concerned that the National Broadband Network has almost ground to a standstill in South Australia, because from the scant information I have been able to access, the cheapest option will cost more than twice what we are paying now.  At present we are on a bundled plan which includes landline, mobile phone and wireless broadband.  Sure, we don't run a business or need super fast internet, but for $20 a month we can get unlimited access, which is fast enough for us, even in a communications black spot.  The cheapest price I have seen for NBN is $49.95 per month!!! Unaffordable and unwarranted for us.