People need to get together via homeowners associations and work towards the goal together. Bishops Court did it successfully, so did Parkhurst and several other communities in Joburg. Here in Constantia our project has just begun market research - in 4 days we have got 10% of households to register for interest.
It really isn't as hard as you may think. Just set up a website, talk with your community and get involved - any community can have it if the market is there.
Right now it's a case of either waiting for Telkom (which may be x years from now) or just getting it done yourself.