It'd become mandatory only if it became an official language, and that'd need a whole lot more infiltration of the government. So I suppose this is worth looking into a little more. Because normally I'd say all large waves of immigration do is change the living environment. The citizens get bent out of shape because the neighborhoods change, and maybe the places where people spend money change. But does the government? Does the formal structure of the country? Does the culture? We need some research data...
Gran,
who do you see on the streets and out and about? Tourists, long term residents, dual citizens? What do these people have access to as far as you can tell? Are they basically walking cash machines for the Australian economy (or whatever economy the casinos belong to) or are they making other kinds of contribution to the society?