The problem is it will never happen without someone putting some very large balls on the line. There is too much pride in their own self worth, and vested interest in protecting the 100's of millions spent so far, to make any switch to the NZ or other systems palatable for them.
Could you imagine anyone in CASA having the ability to step up and basically say" You know what, we have wasted several hundred million of your money, are throwing it all out, and doing a cut and replace on some better regs from over the pond".
Sadly, will never happen, without political direction otherwise. They are so far vested into seeing it finish, they will pump more and more money into it.