Bain could provide the breathing space you suggest to Virgin they could out survive Qantas now, but how much would they be willing to tip in to a business thats grounded due to border closures with no end in sight! Victorians now having total disregard to stage 4 lock downs attending markets and cruising the streets of Melbourne as if the problem is gone.
Even if a vaccine is found tomorrow it will be 12-18months before we get any benefit from it due to testing for approval and its use in Australia premiers are closing borders just from a sniff of corona outbreak to protect their own I'm sure they wont let their own have anything injected into them. Then mass producing, having qualified medical staff to administer the dose the logistical list goes on,this has been reported on various media outlets. we are a very long way away from being out of the woods.