I don't think the aussies will be too badly off after the world cup. It's only 2 years away; There are some good young players who are just below first grade standard who will probably step up for their states in the next two years and beyond.
Players such as Hopes, Haddin, Philipson, Nye, White, Clarke, Watson, Tait, Lee, Cullen, Ronchi will all probably still be under 30 years of age, and this current Australian team has shown that if the stability is there, players can play through until they're 34-35. The biggest worry is the apparent lack of any decent spinner to fill the void of Warne; apart from that there are no huge problems that I can see yet. I think all states have put an emphasis on bringing youth through over the past 2-3 years and I think it will pay off. Australia's stability is something most of the other international teams lack.