What would happen if another theme park like a DL was to open up around the gold coast. I think this would make the other parks go down hill fast and dont think another park would be sustainable in these times. Please discuss I am interested in everyones thoughts.

You're right about the other theme parks going downhill, but if a Disney park was to open on the Gold Coast/Sunshine Coast it would generate enough interest to keep itself very popular, I know we have a much much much smaller population than the Asian centers, but look how phenomenally popular there Disney brand attractions are. However I would imagine that other parks would very very quickly have to compete and expand rapidly, the lengths Knotts has to go to to keep numbers up to DL and DCA down the proverbial street, which makes Knotts Berry Farm a very enjoyable day out

This has been discussed many times over. Try searching Disney and Gold Coast on the forums - you'll find quite a bit.