Apart from the $$$$, it won't happen because:
- Terrain: ILS (being a precision approach) requires to be aligned with runway heading. Damn hill at Currumbin (for 14) an Banora Point (for 32) just won't move.
- Noise: The NA procedures at CG are extensive. Even if with the terrain it was possible, the million-dollar house owners on the above mentioned areas will get their way when they realise their peaceful lifestyle will be interrupted by the whine of jet engines overhead (more than now, anyway!). Take into account a 8NM final on an ILS, and suddenly other suburbs (most of the Gold Coast South of Surfers) will be affected.
I say we should suggest the old Kai Tak approach: track inbound 290 degrees (over water) at a localiser located on Currumbin Hill, have the chequerboard in sight, turn left 150 degrees to intercept final RWY 14. Fewer missed approaches, but more CFITs???
Ahhh, Queensland ... beautiful one day ....