The assets get sold as best they can# to pay the debts to the extent possible, in the order of ranking/seniority, then Virgin Australia just becomes an entry in Wikipedia.
# Subject to certain airports grabbing aircraft
I wouldn't think twitter was a source worth taking too much notice of, especially as the Administrator has represented otherwise.
EDIT: just seen a report that the Administrator might be after some additional cash - so it looks like there is a problem in keeping the thing going until the end of a sale process, which might be 3-4 months more. but if the thing runs out of money, it can cease operating but the sale process keep going. The creditors would need to keep their nerve and not call in liquidators - they will get a better return if its sold as a going concern rather than broken up. Unfortunately, it takes only one big creditor, secure in their knowledge that its at the head of the creditor queue, to stuff it up for everyone.
But there isn't a 'Virgin' anymore, just the corporate under Administration. The Administrator isn't responsible for paying the debts incurred before the Administration took place, rather simply managing the business for a time to achieve what they can to get the best outcome for creditors (first) and then everyone else. If they fail, the creditors just lose - they can't go after the Administrator. I think it was posted up-thread that the Administrator has been granted ?limited relief by the Court to take on some additional liabilities, without being personally liable for them.