H1B has lost its luster because its now a lottery visa, no place for skills. The Indian IT biggies flood H1B market with petitions claiming high skills for a meager developer.
There are also a lot booming startups in many cities spread across India. You can find the best ones there too.
Australian wages are significantly lower than those in the US and for the most part, it isn't on anyone's mind to apply there. In my experience, students apply to Australia when they can't compete for good universities in the US. Canada is very sensitive to GPA values. I know of cases, where literally the absolute cream of the cream, with a strong profile to show for it, have been rejected from Canadian institutes, for reasons that no one seems to have figured out yet.
In the past few years, I know a lot more people who are gravitating towards the EU over the US, but I don't don't hear much about moving to either Canada or Australia for work or education.
That being said, the lottery system for giving the h1b is universally loathed.Some of smartest people I know are struggling to get one, while Infosys keeps sending utterly mediocre people in droves to the US. I hope it does become a merit based system (assuming the number of spots stay constant), I however have no idea as to how merit should be decided.