Thorn bird, what have blizzards got to do with Aus? Yes there would be a lot queueing up but only initially - there would be much holding on the ground, returning/diverting and cancelling of flights.
Nowhere else for GA to go? Around ML: EN, MB, AV all have ILS or instrument approaches. Any number of aerodromes that you could land at visually. VFRs seem to manage it routinely on fairly ordinary weather days.