Don't move the AU servers to Melbourne! That's a ridiculous idea. People who live in the lower half of Australia would have a huge advantage over anyone who lives towards the top of Australia (ME!) At the moment, the servers are hosted in Sydney, and that seems as fair as it can get right now, people from most parts of Australia have more equal ping this way. I don't see any good reason to move the servers to the very bottom of the country away from every single capital city, except Melbourne. This would dramatically affect the amount of satisfaction people living in the north of Australia would have.
I see absolutely no good reason to move the AU servers further south into Melbourne, if any staff or players do see a good, LEGITIMATE, reason to do so, please enlighten me, however I doubt you could convince me it's a good idea. I strongly believe that is one of the worst things that you could possibly do to the Australian servers.