Words of the day - Dutch Disease
In economics, the Dutch disease is the apparent relationship between the increase in exploitation of natural resources and a decline in the manufacturing sector (or agriculture). The mechanism is that an increase in revenues from natural resources (or inflows of foreign aid) will make a given nation's currency stronger compared to that of other nations (manifest in an exchange rate), resulting in the nation's other exports becoming more expensive for other countries to buy, making the manufacturing sector less competitive. While it most often refers to natural resource discovery, it can also refer to "any development that results in a large inflow of foreign currency, including a sharp surge in natural resource prices, foreign assistance, and foreign direct investment".
By by understanding, Australia is the primary consumer for both of these manufacturers. The value of the AUD therefore wouldn't so much be a problem. If anything, all imported components would be cheaper to purchase.
The issue is that consumers have adjusted their expectations to prices they can get from other, new manufacturers, ones whose costs are determined be cheaper labour.
It's on that basis that local manufacturers can't compete.