Hopefully the craze with luxury items is just a fad, much like it was a fad in Japan until the 1980s. Japanese used to buy luxury brand items and travel overseas to showcase how successful they are.
Now not many Japanese travel overseas anymore because they have discovered it is mostly over-hyped. Same thing happened with luxury brand items as it has lost its glamour and prestige, They discovered that there are many craftsman in Japan that can provide better quality products at less cost and designed uniquely to their taste and lifestyle. Fashionistas are more focused now on finding a craftsman or artist that can provide unique products to project one's individualism and lifestyle.
People crave luxury goods item to stand out and show their individualism. Yet the irony you loose your uniqueness once everyone around you becomes affluent and can afford the same luxury goods.
Hopefully. But I think China's got a long road ahead to reach that level of maturity when it comes to spending.
On the issue of wielding consumer power for political purposes, boycotting Australian goods and services is probably going to result in a net gain for China. It can buy those things from elsewhere. Australians are overall already beyond wealthy they don't need another dollar from China. Students who simply must study overseas can study in other countries, maybe even consider diversifying from English speaking ones. While Chinese universities may be spilling over with students, it's an opportunity to create more that provide a certain acceptable quality of education. How hard is it to just multiply the number of second/third rate institutions across the country? They don't need to be like the top 10 universities in China. It's just a matter of infrastructure and teaching content. You'd think a centralised country can pull this off pretty easily.