I do not think that Australia has too many governments. Typically only one form of government will dominate but there may be some fringe forms of government. This is a good thing, and will keep one form of government from being all powerful. People should have choices when it comes to the type of government they want.
I believe the government system is perfect and all the government allows more detailed choices. I believe the government is well constructed. The different levels help sift the laws and ect. To be perfect. It means they suit the public so much better. Why change something that is working fine?