The interesting comments I can see here is talk of "international congestion".
Sorry but there is no such thing, there is plenty of capacity available on SCCN today. Then with TGA and Hawaiki..... Capacity is not something NZ will need to face for many years to come.
Sure it may not be at the wholesale rate your RSP desires but international costs still only represent less than $5 across your whole connection cost.
But one thing I know won't change and that is the speed of light. So until someone can solve that one the latency experienced to AU and US will remain the same which in turn creates a perception of a speed limit due to TCP window and round trip times.