Vaustralia is will be around for a long while in one form or another. See article below
Qantas to stay Australian | smh.com.au
Even if Virgin run out of funds to keep it afloat over the next year or so, there will be someone close buy ready to take it over in order to get hold of those US rights. In fact, it would not surprise me if Virgin have started this venture with the sole purpose of selling it on asap (as soon as profitable).
V