Caliherp is largely correct in the statements he/she has made. The activities of Australian breeders are pretty much a mirror of what is going on elsewhere in the world, the variation being that we are often a bit behind (?) with the latest trends because many of the morphs are first bred overseas and have to be made available to those who bring them in to Oz illegally, and this can take years sometimes.
Australians have a historically conservative view of the management of fauna in captivity, because in recent decades it has been very tightly managed by state authorities, and it is only in the last 12-15 years that reptiles have been generally legalised as pets in most states. This has never been the case in Europe and the US - they have had pretty much open slather for decades to do whatever they wish with their animals (and ours too!). There is also the fact that Carpets (in particular because they, as a group, have enormous potential for experimental fiddling), are part of the Australian landscape, and the view of many Aussies is somewhat more protective of these species than the views of overseas breeders who see them as a great experimental tool.
Historically, Australia has been very slow on the uptake when it comes to breeding reptiles, and in my view this is because we have always had access to animals from the landscape around us, whereas in the US & Europe, apart from smuggled animals, they largely had to learn to breed them or they would forever be in very low (relative) numbers.
I'm beyond the debate about the good & the bad of all this - I prefer fine examples of pure species (but even that is a very subjective assessment), but others don't, so good luck to them. The desire for a unique designer snake won't die out, and each new morph produced galvanizes the activities of the morph breeders out there, and fgives them yet another new tool to work with.
However, I do see it as being a bit like mixing all the colours of the spectrum together - you might get some very attractive blends on the way to your destination, but eventually you always end up with poo brown... the difficulty is knowing when to stop...
Jamie