So, how do non Australian electricians feel about this?
Well, personally I feel that whether it would be a threat to the job or not is largely irrelevant. It's about whether a person has every right to carry out work on his own house or not. Would anyone accept it being law that he could not paint his own window frames or lay his own carpets, because it might take work away from painters and carpet-fitters?
Fair enough, there might be concerns over safety issues such as back-feeding generators which could be used to justify some sort of regulation and control, but it's a big step to go from that to saying that a homeowner should not be allowed to do the work at all.