I would think that any government worth it's salt would be using this 'crisis' to look at what manufacturing/services must come back to it's country (onshore). What is critical to it's national interests, infrastructure.
The Darwin hub makes complete sense, why pour money into another countries (Singapore) asset? This would assume of course that Darwin airport be named as a national infrastructure asset and remain Australian or government owned. That's a massive stretch of course considering that Darwin port is foreign owned.
This philosophy does not need to be isolationist or protective trade wise, it's just saying to the world some goods and services are staying in this country.
I doubt any of this would happen of course, it requires vision, gumption and seeing beyond one electoral cycle.