Australia has a skills gap that is holding back the delivery of projects vital to its future prosperity, so it is in the national interest that we utilise skilled labour from other countries to plug those gaps. Blockading Australia from skilled workers, the majority of which will contribute to our knowledge economy and international competitiveness, is an obvious and huge mistake.
It's no wonder people want to live there and see what it's like. Unfortunately those without a degree are very much restricted when it comes to obtaining employment in Japan due to entry requirements, meaning that funding life over there would be difficult. There is an opportunity to overcome this however, by applying for a Working Holiday Visa.