What a good idea adopting the US regs would be. Then take an ax to the ones we don't need. Could we also stop the CASA fragmentation of private/recreational/sport aviation into little fiefdoms, each of which jealously guards their little (largely illusory) "freedoms" by trying ever so hard to out CASA, CASA. It is OK to roll over and have your tummy tickled, fellas but you don't need to hump CASA's leg. I'm looking at RAAus and GFA here.
If we want some kind of aviation manufcatring industry we are going to have to change the entire CASA funding model too. If the people of Australia demand aviation regulation *they* need to pay for it out of consolidated revenue. At present the industry is forced to pay for its own embuggerment. "User pays" was one of a long line of Malcolm Fraser's bad ideas.
And, Dear God, DO NOT GO ANYWHERE NEAR THE NZ WAY.