I am for changing it, simply because it doesn't really reflect who the country is now. Other countries have changed their. But I would like to see some things retained for historical reasons, and I am all for keeping the design simple. eg stripes of colours (blue, white, maybe green or black) and maybe a smaller southern cross, being of the most southern countries in the world, and though our clean and green skys, we can actually see it in the nights sky.
But I think too many people are confusing the flag, with our national emblem, and they don't have to be the same.