For the one in WA, gas from this area is also the main source of gas used within WA.
In addition to that gas being used "as gas" by consumers it is also the source of over a third of the electricity used in the south-west region (including Perth) and virtually all electricity across most of the rest of WA apart from those communities relying on diesel.
Any major disruption to gas production would thus have an impact on just about every business and individual in WA.
That's a hypothetical "what if?" sort of comment not an actual prediction of imminent destruction of anything. But if it did happen, well there's some seriously important stuff there yes.