Lets just get back to the facts here -
The 457 visa system is a bonafide working aggreement which has been endorsed by government from both sides. Non Australian persons enter this country every day and take up work under the scheme is a variety of industries.
Aviation should be no different. Employers will employ the persons that they want or need under this scheme as long as the criteria is met. That's the way it should be.
You chest thumping sooks can bleat all you like but when we have so many sections of industry screaming for qualified workers, no government is going to exclude a particular segment of the workforce just because a few pilots are sooking about it. If you are as good as you think you are, then you will have no worries getting good jobs here.
Let not forget that aussie pilots head overseas at the drop of a hat and take up flying roles in countries where lots of pilots also compete for employment . Why is that OK ,but we can't ever have any come back this way.
Like I said, if you are as hot as you all say you are, you should have your pick of the best jobs right here!
Reality ............ its not always easy to swallow for some of you!